sys/netinet/tcp_usrreq.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1982, 1986, 1988, 1993
   5  *      The Regents of the University of California.
   6  * Copyright (c) 2006-2007 Robert N. M. Watson
   7  * Copyright (c) 2010-2011 Juniper Networks, Inc.
   8  * All rights reserved.
   9  *
  10  * Portions of this software were developed by Robert N. M. Watson under
  11  * contract to Juniper Networks, Inc.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  *      From: @(#)tcp_usrreq.c  8.2 (Berkeley) 1/3/94
  38  */
  39
  40 #include <sys/cdefs.h>
  41 __FBSDID("$FreeBSD$");
  42
  43 #include "opt_ddb.h"
  44 #include "opt_inet.h"
  45 #include "opt_inet6.h"
  46 #include "opt_ipsec.h"
  47 #include "opt_kern_tls.h"
  48 #include "opt_tcpdebug.h"
  49
  50 #include <sys/param.h>
  51 #include <sys/systm.h>
  52 #include <sys/arb.h>
  53 #include <sys/limits.h>
  54 #include <sys/malloc.h>
  55 #include <sys/refcount.h>
  56 #include <sys/kernel.h>
  57 #include <sys/ktls.h>
  58 #include <sys/qmath.h>
  59 #include <sys/sysctl.h>
  60 #include <sys/mbuf.h>
  61 #ifdef INET6
  62 #include <sys/domain.h>
  63 #endif /* INET6 */
  64 #include <sys/socket.h>
  65 #include <sys/socketvar.h>
  66 #include <sys/protosw.h>
  67 #include <sys/proc.h>
  68 #include <sys/jail.h>
  69 #include <sys/stats.h>
  70
  71 #ifdef DDB
  72 #include <ddb/ddb.h>
  73 #endif
  74
  75 #include <net/if.h>
  76 #include <net/if_var.h>
  77 #include <net/route.h>
  78 #include <net/vnet.h>
  79
  80 #include <netinet/in.h>
  81 #include <netinet/in_kdtrace.h>
  82 #include <netinet/in_pcb.h>
  83 #include <netinet/in_systm.h>
  84 #include <netinet/in_var.h>
  85 #include <netinet/ip_var.h>
  86 #ifdef INET6
  87 #include <netinet/ip6.h>
  88 #include <netinet6/in6_pcb.h>
  89 #include <netinet6/ip6_var.h>
  90 #include <netinet6/scope6_var.h>
  91 #endif
  92 #include <netinet/tcp.h>
  93 #include <netinet/tcp_fsm.h>
  94 #include <netinet/tcp_seq.h>
  95 #include <netinet/tcp_timer.h>
  96 #include <netinet/tcp_var.h>
  97 #include <netinet/tcp_log_buf.h>
  98 #include <netinet/tcpip.h>
  99 #include <netinet/cc/cc.h>
 100 #include <netinet/tcp_fastopen.h>
 101 #include <netinet/tcp_hpts.h>
 102 #ifdef TCPPCAP
 103 #include <netinet/tcp_pcap.h>
 104 #endif
 105 #ifdef TCPDEBUG
 106 #include <netinet/tcp_debug.h>
 107 #endif
 108 #ifdef TCP_OFFLOAD
 109 #include <netinet/tcp_offload.h>
 110 #endif
 111 #include <netipsec/ipsec_support.h>
 112
 113 #include <vm/vm.h>
 114 #include <vm/vm_param.h>
 115 #include <vm/pmap.h>
 116 #include <vm/vm_extern.h>
 117 #include <vm/vm_map.h>
 118 #include <vm/vm_page.h>
 119
 120 /*
 121  * TCP protocol interface to socket abstraction.
 122  */
 123 #ifdef INET
 124 static int      tcp_connect(struct tcpcb *, struct sockaddr *,
 125                     struct thread *td);
 126 #endif /* INET */
 127 #ifdef INET6
 128 static int      tcp6_connect(struct tcpcb *, struct sockaddr *,
 129                     struct thread *td);
 130 #endif /* INET6 */
 131 static void     tcp_disconnect(struct tcpcb *);
 132 static void     tcp_usrclosed(struct tcpcb *);
 133 static void     tcp_fill_info(struct tcpcb *, struct tcp_info *);
 134
 135 static int      tcp_pru_options_support(struct tcpcb *tp, int flags);
 136
 137 #ifdef TCPDEBUG
 138 #define TCPDEBUG0       int ostate = 0
 139 #define TCPDEBUG1()     ostate = tp ? tp->t_state : 0
 140 #define TCPDEBUG2(req)  if (tp && (so->so_options & SO_DEBUG)) \
 141                                 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
 142 #else
 143 #define TCPDEBUG0
 144 #define TCPDEBUG1()
 145 #define TCPDEBUG2(req)
 146 #endif
 147
 148 /*
 149  * tcp_require_unique port requires a globally-unique source port for each
 150  * outgoing connection.  The default is to require the 4-tuple to be unique.
 151  */
 152 VNET_DEFINE(int, tcp_require_unique_port) = 0;
 153 SYSCTL_INT(_net_inet_tcp, OID_AUTO, require_unique_port,
 154     CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(tcp_require_unique_port), 0,
 155     "Require globally-unique ephemeral port for outgoing connections");
 156 #define V_tcp_require_unique_port       VNET(tcp_require_unique_port)
 157
 158 /*
 159  * TCP attaches to socket via pru_attach(), reserving space,
 160  * and an internet control block.
 161  */
 162 static int
 163 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
 164 {
 165         struct inpcb *inp;
 166         struct tcpcb *tp = NULL;
 167         int error;
 168         TCPDEBUG0;
 169
 170         inp = sotoinpcb(so);
 171         KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
 172         TCPDEBUG1();
 173
 174         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 175                 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace);
 176                 if (error)
 177                         goto out;
 178         }
 179
 180         so->so_rcv.sb_flags |= SB_AUTOSIZE;
 181         so->so_snd.sb_flags |= SB_AUTOSIZE;
 182         error = in_pcballoc(so, &V_tcbinfo);
 183         if (error)
 184                 goto out;
 185         inp = sotoinpcb(so);
 186 #ifdef INET6
 187         if (inp->inp_vflag & INP_IPV6PROTO) {
 188                 inp->inp_vflag |= INP_IPV6;
 189                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 190                         inp->inp_vflag |= INP_IPV4;
 191                 inp->in6p_hops = -1;    /* use kernel default */
 192         }
 193         else
 194 #endif
 195                 inp->inp_vflag |= INP_IPV4;
 196         tp = tcp_newtcpcb(inp);
 197         if (tp == NULL) {
 198                 error = ENOBUFS;
 199                 in_pcbdetach(inp);
 200                 in_pcbfree(inp);
 201                 goto out;
 202         }
 203         tp->t_state = TCPS_CLOSED;
 204         INP_WUNLOCK(inp);
 205         TCPSTATES_INC(TCPS_CLOSED);
 206 out:
 207         TCPDEBUG2(PRU_ATTACH);
 208         TCP_PROBE2(debug__user, tp, PRU_ATTACH);
 209         return (error);
 210 }
 211
 212 /*
 213  * tcp_usr_detach is called when the socket layer loses its final reference
 214  * to the socket, be it a file descriptor reference, a reference from TCP,
 215  * etc.  At this point, there is only one case in which we will keep around
 216  * inpcb state: time wait.
 217  */
 218 static void
 219 tcp_usr_detach(struct socket *so)
 220 {
 221         struct inpcb *inp;
 222         struct tcpcb *tp;
 223
 224         inp = sotoinpcb(so);
 225         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 226         INP_WLOCK(inp);
 227         KASSERT(so->so_pcb == inp && inp->inp_socket == so,
 228                 ("%s: socket %p inp %p mismatch", __func__, so, inp));
 229
 230         tp = intotcpcb(inp);
 231
 232         if (inp->inp_flags & INP_TIMEWAIT) {
 233                 /*
 234                  * There are two cases to handle: one in which the time wait
 235                  * state is being discarded (INP_DROPPED), and one in which
 236                  * this connection will remain in timewait.  In the former,
 237                  * it is time to discard all state (except tcptw, which has
 238                  * already been discarded by the timewait close code, which
 239                  * should be further up the call stack somewhere).  In the
 240                  * latter case, we detach from the socket, but leave the pcb
 241                  * present until timewait ends.
 242                  *
 243                  * XXXRW: Would it be cleaner to free the tcptw here?
 244                  *
 245                  * Astute question indeed, from twtcp perspective there are
 246                  * four cases to consider:
 247                  *
 248                  * #1 tcp_usr_detach is called at tcptw creation time by
 249                  *  tcp_twstart, then do not discard the newly created tcptw
 250                  *  and leave inpcb present until timewait ends
 251                  * #2 tcp_usr_detach is called at tcptw creation time by
 252                  *  tcp_twstart, but connection is local and tw will be
 253                  *  discarded immediately
 254                  * #3 tcp_usr_detach is called at timewait end (or reuse) by
 255                  *  tcp_twclose, then the tcptw has already been discarded
 256                  *  (or reused) and inpcb is freed here
 257                  * #4 tcp_usr_detach is called() after timewait ends (or reuse)
 258                  *  (e.g. by soclose), then tcptw has already been discarded
 259                  *  (or reused) and inpcb is freed here
 260                  *
 261                  *  In all three cases the tcptw should not be freed here.
 262                  */
 263                 if (inp->inp_flags & INP_DROPPED) {
 264                         KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && "
 265                             "INP_DROPPED && tp != NULL"));
 266                         in_pcbdetach(inp);
 267                         in_pcbfree(inp);
 268                 } else {
 269                         in_pcbdetach(inp);
 270                         INP_WUNLOCK(inp);
 271                 }
 272         } else {
 273                 /*
 274                  * If the connection is not in timewait, we consider two
 275                  * two conditions: one in which no further processing is
 276                  * necessary (dropped || embryonic), and one in which TCP is
 277                  * not yet done, but no longer requires the socket, so the
 278                  * pcb will persist for the time being.
 279                  *
 280                  * XXXRW: Does the second case still occur?
 281                  */
 282                 if (inp->inp_flags & INP_DROPPED ||
 283                     tp->t_state < TCPS_SYN_SENT) {
 284                         tcp_discardcb(tp);
 285                         in_pcbdetach(inp);
 286                         in_pcbfree(inp);
 287                 } else {
 288                         in_pcbdetach(inp);
 289                         INP_WUNLOCK(inp);
 290                 }
 291         }
 292 }
 293
 294 #ifdef INET
 295 /*
 296  * Give the socket an address.
 297  */
 298 static int
 299 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 300 {
 301         int error = 0;
 302         struct inpcb *inp;
 303         struct tcpcb *tp = NULL;
 304         struct sockaddr_in *sinp;
 305
 306         sinp = (struct sockaddr_in *)nam;
 307         if (nam->sa_family != AF_INET) {
 308                 /*
 309                  * Preserve compatibility with old programs.
 310                  */
 311                 if (nam->sa_family != AF_UNSPEC ||
 312                     nam->sa_len < offsetof(struct sockaddr_in, sin_zero) ||
 313                     sinp->sin_addr.s_addr != INADDR_ANY)
 314                         return (EAFNOSUPPORT);
 315                 nam->sa_family = AF_INET;
 316         }
 317         if (nam->sa_len != sizeof(*sinp))
 318                 return (EINVAL);
 319
 320         /*
 321          * Must check for multicast addresses and disallow binding
 322          * to them.
 323          */
 324         if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 325                 return (EAFNOSUPPORT);
 326
 327         TCPDEBUG0;
 328         inp = sotoinpcb(so);
 329         KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
 330         INP_WLOCK(inp);
 331         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 332                 error = EINVAL;
 333                 goto out;
 334         }
 335         tp = intotcpcb(inp);
 336         TCPDEBUG1();
 337         INP_HASH_WLOCK(&V_tcbinfo);
 338         error = in_pcbbind(inp, nam, td->td_ucred);
 339         INP_HASH_WUNLOCK(&V_tcbinfo);
 340 out:
 341         TCPDEBUG2(PRU_BIND);
 342         TCP_PROBE2(debug__user, tp, PRU_BIND);
 343         INP_WUNLOCK(inp);
 344
 345         return (error);
 346 }
 347 #endif /* INET */
 348
 349 #ifdef INET6
 350 static int
 351 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 352 {
 353         int error = 0;
 354         struct inpcb *inp;
 355         struct tcpcb *tp = NULL;
 356         struct sockaddr_in6 *sin6;
 357         u_char vflagsav;
 358
 359         sin6 = (struct sockaddr_in6 *)nam;
 360         if (nam->sa_family != AF_INET6)
 361                 return (EAFNOSUPPORT);
 362         if (nam->sa_len != sizeof(*sin6))
 363                 return (EINVAL);
 364
 365         /*
 366          * Must check for multicast addresses and disallow binding
 367          * to them.
 368          */
 369         if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
 370                 return (EAFNOSUPPORT);
 371
 372         TCPDEBUG0;
 373         inp = sotoinpcb(so);
 374         KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
 375         INP_WLOCK(inp);
 376         vflagsav = inp->inp_vflag;
 377         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 378                 error = EINVAL;
 379                 goto out;
 380         }
 381         tp = intotcpcb(inp);
 382         TCPDEBUG1();
 383         INP_HASH_WLOCK(&V_tcbinfo);
 384         inp->inp_vflag &= ~INP_IPV4;
 385         inp->inp_vflag |= INP_IPV6;
 386 #ifdef INET
 387         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 388                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 389                         inp->inp_vflag |= INP_IPV4;
 390                 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 391                         struct sockaddr_in sin;
 392
 393                         in6_sin6_2_sin(&sin, sin6);
 394                         if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 395                                 error = EAFNOSUPPORT;
 396                                 INP_HASH_WUNLOCK(&V_tcbinfo);
 397                                 goto out;
 398                         }
 399                         inp->inp_vflag |= INP_IPV4;
 400                         inp->inp_vflag &= ~INP_IPV6;
 401                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
 402                             td->td_ucred);
 403                         INP_HASH_WUNLOCK(&V_tcbinfo);
 404                         goto out;
 405                 }
 406         }
 407 #endif
 408         error = in6_pcbbind(inp, nam, td->td_ucred);
 409         INP_HASH_WUNLOCK(&V_tcbinfo);
 410 out:
 411         if (error != 0)
 412                 inp->inp_vflag = vflagsav;
 413         TCPDEBUG2(PRU_BIND);
 414         TCP_PROBE2(debug__user, tp, PRU_BIND);
 415         INP_WUNLOCK(inp);
 416         return (error);
 417 }
 418 #endif /* INET6 */
 419
 420 #ifdef INET
 421 /*
 422  * Prepare to accept connections.
 423  */
 424 static int
 425 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
 426 {
 427         int error = 0;
 428         struct inpcb *inp;
 429         struct tcpcb *tp = NULL;
 430
 431         TCPDEBUG0;
 432         inp = sotoinpcb(so);
 433         KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
 434         INP_WLOCK(inp);
 435         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 436                 error = EINVAL;
 437                 goto out;
 438         }
 439         tp = intotcpcb(inp);
 440         TCPDEBUG1();
 441         SOCK_LOCK(so);
 442         error = solisten_proto_check(so);
 443         if (error != 0) {
 444                 SOCK_UNLOCK(so);
 445                 goto out;
 446         }
 447         if (inp->inp_lport == 0) {
 448                 INP_HASH_WLOCK(&V_tcbinfo);
 449                 error = in_pcbbind(inp, NULL, td->td_ucred);
 450                 INP_HASH_WUNLOCK(&V_tcbinfo);
 451         }
 452         if (error == 0) {
 453                 tcp_state_change(tp, TCPS_LISTEN);
 454                 solisten_proto(so, backlog);
 455 #ifdef TCP_OFFLOAD
 456                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 457                         tcp_offload_listen_start(tp);
 458 #endif
 459         } else {
 460                 solisten_proto_abort(so);
 461         }
 462         SOCK_UNLOCK(so);
 463
 464         if (IS_FASTOPEN(tp->t_flags))
 465                 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
 466
 467 out:
 468         TCPDEBUG2(PRU_LISTEN);
 469         TCP_PROBE2(debug__user, tp, PRU_LISTEN);
 470         INP_WUNLOCK(inp);
 471         return (error);
 472 }
 473 #endif /* INET */
 474
 475 #ifdef INET6
 476 static int
 477 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
 478 {
 479         int error = 0;
 480         struct inpcb *inp;
 481         struct tcpcb *tp = NULL;
 482         u_char vflagsav;
 483
 484         TCPDEBUG0;
 485         inp = sotoinpcb(so);
 486         KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
 487         INP_WLOCK(inp);
 488         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 489                 error = EINVAL;
 490                 goto out;
 491         }
 492         vflagsav = inp->inp_vflag;
 493         tp = intotcpcb(inp);
 494         TCPDEBUG1();
 495         SOCK_LOCK(so);
 496         error = solisten_proto_check(so);
 497         if (error != 0) {
 498                 SOCK_UNLOCK(so);
 499                 goto out;
 500         }
 501         INP_HASH_WLOCK(&V_tcbinfo);
 502         if (inp->inp_lport == 0) {
 503                 inp->inp_vflag &= ~INP_IPV4;
 504                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 505                         inp->inp_vflag |= INP_IPV4;
 506                 error = in6_pcbbind(inp, NULL, td->td_ucred);
 507         }
 508         INP_HASH_WUNLOCK(&V_tcbinfo);
 509         if (error == 0) {
 510                 tcp_state_change(tp, TCPS_LISTEN);
 511                 solisten_proto(so, backlog);
 512 #ifdef TCP_OFFLOAD
 513                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 514                         tcp_offload_listen_start(tp);
 515 #endif
 516         } else {
 517                 solisten_proto_abort(so);
 518         }
 519         SOCK_UNLOCK(so);
 520
 521         if (IS_FASTOPEN(tp->t_flags))
 522                 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
 523
 524         if (error != 0)
 525                 inp->inp_vflag = vflagsav;
 526
 527 out:
 528         TCPDEBUG2(PRU_LISTEN);
 529         TCP_PROBE2(debug__user, tp, PRU_LISTEN);
 530         INP_WUNLOCK(inp);
 531         return (error);
 532 }
 533 #endif /* INET6 */
 534
 535 #ifdef INET
 536 /*
 537  * Initiate connection to peer.
 538  * Create a template for use in transmissions on this connection.
 539  * Enter SYN_SENT state, and mark socket as connecting.
 540  * Start keep-alive timer, and seed output sequence space.
 541  * Send initial segment on connection.
 542  */
 543 static int
 544 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 545 {
 546         struct epoch_tracker et;
 547         int error = 0;
 548         struct inpcb *inp;
 549         struct tcpcb *tp = NULL;
 550         struct sockaddr_in *sinp;
 551
 552         sinp = (struct sockaddr_in *)nam;
 553         if (nam->sa_family != AF_INET)
 554                 return (EAFNOSUPPORT);
 555         if (nam->sa_len != sizeof (*sinp))
 556                 return (EINVAL);
 557
 558         /*
 559          * Must disallow TCP ``connections'' to multicast addresses.
 560          */
 561         if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 562                 return (EAFNOSUPPORT);
 563         if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST)
 564                 return (EACCES);
 565         if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
 566                 return (error);
 567
 568         TCPDEBUG0;
 569         inp = sotoinpcb(so);
 570         KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
 571         INP_WLOCK(inp);
 572         if (inp->inp_flags & INP_TIMEWAIT) {
 573                 error = EADDRINUSE;
 574                 goto out;
 575         }
 576         if (inp->inp_flags & INP_DROPPED) {
 577                 error = ECONNREFUSED;
 578                 goto out;
 579         }
 580         if (SOLISTENING(so)) {
 581                 error = EOPNOTSUPP;
 582                 goto out;
 583         }
 584         tp = intotcpcb(inp);
 585         TCPDEBUG1();
 586         NET_EPOCH_ENTER(et);
 587         if ((error = tcp_connect(tp, nam, td)) != 0)
 588                 goto out_in_epoch;
 589 #ifdef TCP_OFFLOAD
 590         if (registered_toedevs > 0 &&
 591             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 592             (error = tcp_offload_connect(so, nam)) == 0)
 593                 goto out_in_epoch;
 594 #endif
 595         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 596         error = tcp_output(tp);
 597         KASSERT(error >= 0, ("TCP stack %s requested tcp_drop(%p) at connect()"
 598             ", error code %d", tp->t_fb->tfb_tcp_block_name, tp, -error));
 599 out_in_epoch:
 600         NET_EPOCH_EXIT(et);
 601 out:
 602         TCPDEBUG2(PRU_CONNECT);
 603         TCP_PROBE2(debug__user, tp, PRU_CONNECT);
 604         INP_WUNLOCK(inp);
 605         return (error);
 606 }
 607 #endif /* INET */
 608
 609 #ifdef INET6
 610 static int
 611 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 612 {
 613         struct epoch_tracker et;
 614         int error = 0;
 615         struct inpcb *inp;
 616         struct tcpcb *tp = NULL;
 617         struct sockaddr_in6 *sin6;
 618         u_int8_t incflagsav;
 619         u_char vflagsav;
 620
 621         TCPDEBUG0;
 622
 623         sin6 = (struct sockaddr_in6 *)nam;
 624         if (nam->sa_family != AF_INET6)
 625                 return (EAFNOSUPPORT);
 626         if (nam->sa_len != sizeof (*sin6))
 627                 return (EINVAL);
 628
 629         /*
 630          * Must disallow TCP ``connections'' to multicast addresses.
 631          */
 632         if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
 633                 return (EAFNOSUPPORT);
 634
 635         inp = sotoinpcb(so);
 636         KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
 637         INP_WLOCK(inp);
 638         vflagsav = inp->inp_vflag;
 639         incflagsav = inp->inp_inc.inc_flags;
 640         if (inp->inp_flags & INP_TIMEWAIT) {
 641                 error = EADDRINUSE;
 642                 goto out;
 643         }
 644         if (inp->inp_flags & INP_DROPPED) {
 645                 error = ECONNREFUSED;
 646                 goto out;
 647         }
 648         if (SOLISTENING(so)) {
 649                 error = EINVAL;
 650                 goto out;
 651         }
 652         tp = intotcpcb(inp);
 653         TCPDEBUG1();
 654 #ifdef INET
 655         /*
 656          * XXXRW: Some confusion: V4/V6 flags relate to binding, and
 657          * therefore probably require the hash lock, which isn't held here.
 658          * Is this a significant problem?
 659          */
 660         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 661                 struct sockaddr_in sin;
 662
 663                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 664                         error = EINVAL;
 665                         goto out;
 666                 }
 667                 if ((inp->inp_vflag & INP_IPV4) == 0) {
 668                         error = EAFNOSUPPORT;
 669                         goto out;
 670                 }
 671
 672                 in6_sin6_2_sin(&sin, sin6);
 673                 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 674                         error = EAFNOSUPPORT;
 675                         goto out;
 676                 }
 677                 if (ntohl(sin.sin_addr.s_addr) == INADDR_BROADCAST) {
 678                         error = EACCES;
 679                         goto out;
 680                 }
 681                 if ((error = prison_remote_ip4(td->td_ucred,
 682                     &sin.sin_addr)) != 0)
 683                         goto out;
 684                 inp->inp_vflag |= INP_IPV4;
 685                 inp->inp_vflag &= ~INP_IPV6;
 686                 NET_EPOCH_ENTER(et);
 687                 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
 688                         goto out_in_epoch;
 689 #ifdef TCP_OFFLOAD
 690                 if (registered_toedevs > 0 &&
 691                     (so->so_options & SO_NO_OFFLOAD) == 0 &&
 692                     (error = tcp_offload_connect(so, nam)) == 0)
 693                         goto out_in_epoch;
 694 #endif
 695                 error = tcp_output(tp);
 696                 goto out_in_epoch;
 697         } else {
 698                 if ((inp->inp_vflag & INP_IPV6) == 0) {
 699                         error = EAFNOSUPPORT;
 700                         goto out;
 701                 }
 702         }
 703 #endif
 704         if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0)
 705                 goto out;
 706         inp->inp_vflag &= ~INP_IPV4;
 707         inp->inp_vflag |= INP_IPV6;
 708         inp->inp_inc.inc_flags |= INC_ISIPV6;
 709         if ((error = tcp6_connect(tp, nam, td)) != 0)
 710                 goto out;
 711 #ifdef TCP_OFFLOAD
 712         if (registered_toedevs > 0 &&
 713             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 714             (error = tcp_offload_connect(so, nam)) == 0)
 715                 goto out;
 716 #endif
 717         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 718         NET_EPOCH_ENTER(et);
 719         error = tcp_output(tp);
 720 #ifdef INET
 721 out_in_epoch:
 722 #endif
 723         NET_EPOCH_EXIT(et);
 724 out:
 725         KASSERT(error >= 0, ("TCP stack %s requested tcp_drop(%p) at connect()"
 726             ", error code %d", tp->t_fb->tfb_tcp_block_name, tp, -error));
 727         /*
 728          * If the implicit bind in the connect call fails, restore
 729          * the flags we modified.
 730          */
 731         if (error != 0 && inp->inp_lport == 0) {
 732                 inp->inp_vflag = vflagsav;
 733                 inp->inp_inc.inc_flags = incflagsav;
 734         }
 735
 736         TCPDEBUG2(PRU_CONNECT);
 737         TCP_PROBE2(debug__user, tp, PRU_CONNECT);
 738         INP_WUNLOCK(inp);
 739         return (error);
 740 }
 741 #endif /* INET6 */
 742
 743 /*
 744  * Initiate disconnect from peer.
 745  * If connection never passed embryonic stage, just drop;
 746  * else if don't need to let data drain, then can just drop anyways,
 747  * else have to begin TCP shutdown process: mark socket disconnecting,
 748  * drain unread data, state switch to reflect user close, and
 749  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
 750  * when peer sends FIN and acks ours.
 751  *
 752  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
 753  */
 754 static int
 755 tcp_usr_disconnect(struct socket *so)
 756 {
 757         struct inpcb *inp;
 758         struct tcpcb *tp = NULL;
 759         struct epoch_tracker et;
 760         int error = 0;
 761
 762         TCPDEBUG0;
 763         NET_EPOCH_ENTER(et);
 764         inp = sotoinpcb(so);
 765         KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
 766         INP_WLOCK(inp);
 767         if (inp->inp_flags & INP_TIMEWAIT)
 768                 goto out;
 769         if (inp->inp_flags & INP_DROPPED) {
 770                 error = ECONNRESET;
 771                 goto out;
 772         }
 773         tp = intotcpcb(inp);
 774         TCPDEBUG1();
 775         tcp_disconnect(tp);
 776 out:
 777         TCPDEBUG2(PRU_DISCONNECT);
 778         TCP_PROBE2(debug__user, tp, PRU_DISCONNECT);
 779         INP_WUNLOCK(inp);
 780         NET_EPOCH_EXIT(et);
 781         return (error);
 782 }
 783
 784 #ifdef INET
 785 /*
 786  * Accept a connection.  Essentially all the work is done at higher levels;
 787  * just return the address of the peer, storing through addr.
 788  */
 789 static int
 790 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
 791 {
 792         int error = 0;
 793         struct inpcb *inp = NULL;
 794         struct tcpcb *tp = NULL;
 795         struct in_addr addr;
 796         in_port_t port = 0;
 797         TCPDEBUG0;
 798
 799         if (so->so_state & SS_ISDISCONNECTED)
 800                 return (ECONNABORTED);
 801
 802         inp = sotoinpcb(so);
 803         KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
 804         INP_WLOCK(inp);
 805         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 806                 error = ECONNABORTED;
 807                 goto out;
 808         }
 809         tp = intotcpcb(inp);
 810         TCPDEBUG1();
 811
 812         /*
 813          * We inline in_getpeeraddr and COMMON_END here, so that we can
 814          * copy the data of interest and defer the malloc until after we
 815          * release the lock.
 816          */
 817         port = inp->inp_fport;
 818         addr = inp->inp_faddr;
 819
 820 out:
 821         TCPDEBUG2(PRU_ACCEPT);
 822         TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
 823         INP_WUNLOCK(inp);
 824         if (error == 0)
 825                 *nam = in_sockaddr(port, &addr);
 826         return error;
 827 }
 828 #endif /* INET */
 829
 830 #ifdef INET6
 831 static int
 832 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
 833 {
 834         struct inpcb *inp = NULL;
 835         int error = 0;
 836         struct tcpcb *tp = NULL;
 837         struct in_addr addr;
 838         struct in6_addr addr6;
 839         struct epoch_tracker et;
 840         in_port_t port = 0;
 841         int v4 = 0;
 842         TCPDEBUG0;
 843
 844         if (so->so_state & SS_ISDISCONNECTED)
 845                 return (ECONNABORTED);
 846
 847         inp = sotoinpcb(so);
 848         KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
 849         NET_EPOCH_ENTER(et);
 850         INP_WLOCK(inp);
 851         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 852                 error = ECONNABORTED;
 853                 goto out;
 854         }
 855         tp = intotcpcb(inp);
 856         TCPDEBUG1();
 857
 858         /*
 859          * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
 860          * copy the data of interest and defer the malloc until after we
 861          * release the lock.
 862          */
 863         if (inp->inp_vflag & INP_IPV4) {
 864                 v4 = 1;
 865                 port = inp->inp_fport;
 866                 addr = inp->inp_faddr;
 867         } else {
 868                 port = inp->inp_fport;
 869                 addr6 = inp->in6p_faddr;
 870         }
 871
 872 out:
 873         TCPDEBUG2(PRU_ACCEPT);
 874         TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
 875         INP_WUNLOCK(inp);
 876         NET_EPOCH_EXIT(et);
 877         if (error == 0) {
 878                 if (v4)
 879                         *nam = in6_v4mapsin6_sockaddr(port, &addr);
 880                 else
 881                         *nam = in6_sockaddr(port, &addr6);
 882         }
 883         return error;
 884 }
 885 #endif /* INET6 */
 886
 887 /*
 888  * Mark the connection as being incapable of further output.
 889  */
 890 static int
 891 tcp_usr_shutdown(struct socket *so)
 892 {
 893         int error = 0;
 894         struct inpcb *inp;
 895         struct tcpcb *tp = NULL;
 896         struct epoch_tracker et;
 897
 898         TCPDEBUG0;
 899         inp = sotoinpcb(so);
 900         KASSERT(inp != NULL, ("inp == NULL"));
 901         INP_WLOCK(inp);
 902         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 903                 INP_WUNLOCK(inp);
 904                 return (ECONNRESET);
 905         }
 906         tp = intotcpcb(inp);
 907         NET_EPOCH_ENTER(et);
 908         TCPDEBUG1();
 909         socantsendmore(so);
 910         tcp_usrclosed(tp);
 911         if (!(inp->inp_flags & INP_DROPPED))
 912                 error = tcp_output_nodrop(tp);
 913         TCPDEBUG2(PRU_SHUTDOWN);
 914         TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN);
 915         error = tcp_unlock_or_drop(tp, error);
 916         NET_EPOCH_EXIT(et);
 917
 918         return (error);
 919 }
 920
 921 /*
 922  * After a receive, possibly send window update to peer.
 923  */
 924 static int
 925 tcp_usr_rcvd(struct socket *so, int flags)
 926 {
 927         struct epoch_tracker et;
 928         struct inpcb *inp;
 929         struct tcpcb *tp = NULL;
 930         int outrv = 0, error = 0;
 931
 932         TCPDEBUG0;
 933         inp = sotoinpcb(so);
 934         KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
 935         INP_WLOCK(inp);
 936         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 937                 INP_WUNLOCK(inp);
 938                 return (ECONNRESET);
 939         }
 940         tp = intotcpcb(inp);
 941         NET_EPOCH_ENTER(et);
 942         TCPDEBUG1();
 943         /*
 944          * For passively-created TFO connections, don't attempt a window
 945          * update while still in SYN_RECEIVED as this may trigger an early
 946          * SYN|ACK.  It is preferable to have the SYN|ACK be sent along with
 947          * application response data, or failing that, when the DELACK timer
 948          * expires.
 949          */
 950         if (IS_FASTOPEN(tp->t_flags) &&
 951             (tp->t_state == TCPS_SYN_RECEIVED))
 952                 goto out;
 953 #ifdef TCP_OFFLOAD
 954         if (tp->t_flags & TF_TOE)
 955                 tcp_offload_rcvd(tp);
 956         else
 957 #endif
 958                 outrv = tcp_output_nodrop(tp);
 959 out:
 960         TCPDEBUG2(PRU_RCVD);
 961         TCP_PROBE2(debug__user, tp, PRU_RCVD);
 962         (void) tcp_unlock_or_drop(tp, outrv);
 963         NET_EPOCH_EXIT(et);
 964         return (error);
 965 }
 966
 967 /*
 968  * Do a send by putting data in output queue and updating urgent
 969  * marker if URG set.  Possibly send more data.  Unlike the other
 970  * pru_*() routines, the mbuf chains are our responsibility.  We
 971  * must either enqueue them or free them.  The other pru_* routines
 972  * generally are caller-frees.
 973  */
 974 static int
 975 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
 976     struct sockaddr *nam, struct mbuf *control, struct thread *td)
 977 {
 978         struct epoch_tracker et;
 979         int error = 0;
 980         struct inpcb *inp;
 981         struct tcpcb *tp = NULL;
 982 #ifdef INET
 983 #ifdef INET6
 984         struct sockaddr_in sin;
 985 #endif
 986         struct sockaddr_in *sinp;
 987 #endif
 988 #ifdef INET6
 989         int isipv6;
 990 #endif
 991         u_int8_t incflagsav;
 992         u_char vflagsav;
 993         bool restoreflags;
 994         TCPDEBUG0;
 995
 996         if (control != NULL) {
 997                 /* TCP doesn't do control messages (rights, creds, etc) */
 998                 if (control->m_len) {
 999                         m_freem(control);
1000                         return (EINVAL);
1001                 }
1002                 m_freem(control);       /* empty control, just free it */
1003         }
1004
1005         inp = sotoinpcb(so);
1006         KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
1007         INP_WLOCK(inp);
1008         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1009                 if (m != NULL && (flags & PRUS_NOTREADY) == 0)
1010                         m_freem(m);
1011                 INP_WUNLOCK(inp);
1012                 return (ECONNRESET);
1013         }
1014
1015         vflagsav = inp->inp_vflag;
1016         incflagsav = inp->inp_inc.inc_flags;
1017         restoreflags = false;
1018         tp = intotcpcb(inp);
1019
1020         NET_EPOCH_ENTER(et);
1021         if ((flags & PRUS_OOB) != 0 &&
1022             (error = tcp_pru_options_support(tp, PRUS_OOB)) != 0)
1023                 goto out;
1024
1025         TCPDEBUG1();
1026         if (nam != NULL && tp->t_state < TCPS_SYN_SENT) {
1027                 if (tp->t_state == TCPS_LISTEN) {
1028                         error = EINVAL;
1029                         goto out;
1030                 }
1031                 switch (nam->sa_family) {
1032 #ifdef INET
1033                 case AF_INET:
1034                         sinp = (struct sockaddr_in *)nam;
1035                         if (sinp->sin_len != sizeof(struct sockaddr_in)) {
1036                                 error = EINVAL;
1037                                 goto out;
1038                         }
1039                         if ((inp->inp_vflag & INP_IPV6) != 0) {
1040                                 error = EAFNOSUPPORT;
1041                                 goto out;
1042                         }
1043                         if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
1044                                 error = EAFNOSUPPORT;
1045                                 goto out;
1046                         }
1047                         if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) {
1048                                 error = EACCES;
1049                                 goto out;
1050                         }
1051                         if ((error = prison_remote_ip4(td->td_ucred,
1052                             &sinp->sin_addr)))
1053                                 goto out;
1054 #ifdef INET6
1055                         isipv6 = 0;
1056 #endif
1057                         break;
1058 #endif /* INET */
1059 #ifdef INET6
1060                 case AF_INET6:
1061                 {
1062                         struct sockaddr_in6 *sin6;
1063
1064                         sin6 = (struct sockaddr_in6 *)nam;
1065                         if (sin6->sin6_len != sizeof(*sin6)) {
1066                                 error = EINVAL;
1067                                 goto out;
1068                         }
1069                         if ((inp->inp_vflag & INP_IPV6PROTO) == 0) {
1070                                 error = EAFNOSUPPORT;
1071                                 goto out;
1072                         }
1073                         if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
1074                                 error = EAFNOSUPPORT;
1075                                 goto out;
1076                         }
1077                         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1078 #ifdef INET
1079                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1080                                         error = EINVAL;
1081                                         goto out;
1082                                 }
1083                                 if ((inp->inp_vflag & INP_IPV4) == 0) {
1084                                         error = EAFNOSUPPORT;
1085                                         goto out;
1086                                 }
1087                                 restoreflags = true;
1088                                 inp->inp_vflag &= ~INP_IPV6;
1089                                 sinp = &sin;
1090                                 in6_sin6_2_sin(sinp, sin6);
1091                                 if (IN_MULTICAST(
1092                                     ntohl(sinp->sin_addr.s_addr))) {
1093                                         error = EAFNOSUPPORT;
1094                                         goto out;
1095                                 }
1096                                 if ((error = prison_remote_ip4(td->td_ucred,
1097                                     &sinp->sin_addr)))
1098                                         goto out;
1099                                 isipv6 = 0;
1100 #else /* !INET */
1101                                 error = EAFNOSUPPORT;
1102                                 goto out;
1103 #endif /* INET */
1104                         } else {
1105                                 if ((inp->inp_vflag & INP_IPV6) == 0) {
1106                                         error = EAFNOSUPPORT;
1107                                         goto out;
1108                                 }
1109                                 restoreflags = true;
1110                                 inp->inp_vflag &= ~INP_IPV4;
1111                                 inp->inp_inc.inc_flags |= INC_ISIPV6;
1112                                 if ((error = prison_remote_ip6(td->td_ucred,
1113                                     &sin6->sin6_addr)))
1114                                         goto out;
1115                                 isipv6 = 1;
1116                         }
1117                         break;
1118                 }
1119 #endif /* INET6 */
1120                 default:
1121                         error = EAFNOSUPPORT;
1122                         goto out;
1123                 }
1124         }
1125         if (!(flags & PRUS_OOB)) {
1126                 sbappendstream(&so->so_snd, m, flags);
1127                 m = NULL;
1128                 if (nam && tp->t_state < TCPS_SYN_SENT) {
1129                         KASSERT(tp->t_state == TCPS_CLOSED,
1130                             ("%s: tp %p is listening", __func__, tp));
1131
1132                         /*
1133                          * Do implied connect if not yet connected,
1134                          * initialize window to default value, and
1135                          * initialize maxseg using peer's cached MSS.
1136                          */
1137 #ifdef INET6
1138                         if (isipv6)
1139                                 error = tcp6_connect(tp, nam, td);
1140 #endif /* INET6 */
1141 #if defined(INET6) && defined(INET)
1142                         else
1143 #endif
1144 #ifdef INET
1145                                 error = tcp_connect(tp,
1146                                     (struct sockaddr *)sinp, td);
1147 #endif
1148                         /*
1149                          * The bind operation in tcp_connect succeeded. We
1150                          * no longer want to restore the flags if later
1151                          * operations fail.
1152                          */
1153                         if (error == 0 || inp->inp_lport != 0)
1154                                 restoreflags = false;
1155
1156                         if (error) {
1157                                 /* m is freed if PRUS_NOTREADY is unset. */
1158                                 sbflush(&so->so_snd);
1159                                 goto out;
1160                         }
1161                         if (IS_FASTOPEN(tp->t_flags))
1162                                 tcp_fastopen_connect(tp);
1163                         else {
1164                                 tp->snd_wnd = TTCP_CLIENT_SND_WND;
1165                                 tcp_mss(tp, -1);
1166                         }
1167                 }
1168                 if (flags & PRUS_EOF) {
1169                         /*
1170                          * Close the send side of the connection after
1171                          * the data is sent.
1172                          */
1173                         socantsendmore(so);
1174                         tcp_usrclosed(tp);
1175                 }
1176                 if (TCPS_HAVEESTABLISHED(tp->t_state) &&
1177                     ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) &&
1178                     (tp->t_fbyte_out == 0) &&
1179                     (so->so_snd.sb_ccc > 0)) {
1180                         tp->t_fbyte_out = ticks;
1181                         if (tp->t_fbyte_out == 0)
1182                                 tp->t_fbyte_out = 1;
1183                         if (tp->t_fbyte_out && tp->t_fbyte_in)
1184                                 tp->t_flags2 |= TF2_FBYTES_COMPLETE;
1185                 }
1186                 if (!(inp->inp_flags & INP_DROPPED) &&
1187                     !(flags & PRUS_NOTREADY)) {
1188                         if (flags & PRUS_MORETOCOME)
1189                                 tp->t_flags |= TF_MORETOCOME;
1190                         error = tcp_output_nodrop(tp);
1191                         if (flags & PRUS_MORETOCOME)
1192                                 tp->t_flags &= ~TF_MORETOCOME;
1193                 }
1194         } else {
1195                 /*
1196                  * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
1197                  */
1198                 SOCKBUF_LOCK(&so->so_snd);
1199                 if (sbspace(&so->so_snd) < -512) {
1200                         SOCKBUF_UNLOCK(&so->so_snd);
1201                         error = ENOBUFS;
1202                         goto out;
1203                 }
1204                 /*
1205                  * According to RFC961 (Assigned Protocols),
1206                  * the urgent pointer points to the last octet
1207                  * of urgent data.  We continue, however,
1208                  * to consider it to indicate the first octet
1209                  * of data past the urgent section.
1210                  * Otherwise, snd_up should be one lower.
1211                  */
1212                 sbappendstream_locked(&so->so_snd, m, flags);
1213                 SOCKBUF_UNLOCK(&so->so_snd);
1214                 m = NULL;
1215                 if (nam && tp->t_state < TCPS_SYN_SENT) {
1216                         /*
1217                          * Do implied connect if not yet connected,
1218                          * initialize window to default value, and
1219                          * initialize maxseg using peer's cached MSS.
1220                          */
1221
1222                         /*
1223                          * Not going to contemplate SYN|URG
1224                          */
1225                         if (IS_FASTOPEN(tp->t_flags))
1226                                 tp->t_flags &= ~TF_FASTOPEN;
1227 #ifdef INET6
1228                         if (isipv6)
1229                                 error = tcp6_connect(tp, nam, td);
1230 #endif /* INET6 */
1231 #if defined(INET6) && defined(INET)
1232                         else
1233 #endif
1234 #ifdef INET
1235                                 error = tcp_connect(tp,
1236                                     (struct sockaddr *)sinp, td);
1237 #endif
1238                         /*
1239                          * The bind operation in tcp_connect succeeded. We
1240                          * no longer want to restore the flags if later
1241                          * operations fail.
1242                          */
1243                         if (error == 0 || inp->inp_lport != 0)
1244                                 restoreflags = false;
1245
1246                         if (error != 0) {
1247                                 /* m is freed if PRUS_NOTREADY is unset. */
1248                                 sbflush(&so->so_snd);
1249                                 goto out;
1250                         }
1251                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
1252                         tcp_mss(tp, -1);
1253                 }
1254                 tp->snd_up = tp->snd_una + sbavail(&so->so_snd);
1255                 if ((flags & PRUS_NOTREADY) == 0) {
1256                         tp->t_flags |= TF_FORCEDATA;
1257                         error = tcp_output_nodrop(tp);
1258                         tp->t_flags &= ~TF_FORCEDATA;
1259                 }
1260         }
1261         TCP_LOG_EVENT(tp, NULL,
1262             &inp->inp_socket->so_rcv,
1263             &inp->inp_socket->so_snd,
1264             TCP_LOG_USERSEND, error,
1265             0, NULL, false);
1266
1267 out:
1268         /*
1269          * In case of PRUS_NOTREADY, the caller or tcp_usr_ready() is
1270          * responsible for freeing memory.
1271          */
1272         if (m != NULL && (flags & PRUS_NOTREADY) == 0)
1273                 m_freem(m);
1274
1275         /*
1276          * If the request was unsuccessful and we changed flags,
1277          * restore the original flags.
1278          */
1279         if (error != 0 && restoreflags) {
1280                 inp->inp_vflag = vflagsav;
1281                 inp->inp_inc.inc_flags = incflagsav;
1282         }
1283         TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
1284                   ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1285         TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB :
1286                    ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1287         error = tcp_unlock_or_drop(tp, error);
1288         NET_EPOCH_EXIT(et);
1289         return (error);
1290 }
1291
1292 static int
1293 tcp_usr_ready(struct socket *so, struct mbuf *m, int count)
1294 {
1295         struct epoch_tracker et;
1296         struct inpcb *inp;
1297         struct tcpcb *tp;
1298         int error;
1299
1300         inp = sotoinpcb(so);
1301         INP_WLOCK(inp);
1302         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1303                 INP_WUNLOCK(inp);
1304                 mb_free_notready(m, count);
1305                 return (ECONNRESET);
1306         }
1307         tp = intotcpcb(inp);
1308
1309         SOCKBUF_LOCK(&so->so_snd);
1310         error = sbready(&so->so_snd, m, count);
1311         SOCKBUF_UNLOCK(&so->so_snd);
1312         if (error) {
1313                 INP_WUNLOCK(inp);
1314                 return (error);
1315         }
1316         NET_EPOCH_ENTER(et);
1317         error = tcp_output_unlock(tp);
1318         NET_EPOCH_EXIT(et);
1319
1320         return (error);
1321 }
1322
1323 /*
1324  * Abort the TCP.  Drop the connection abruptly.
1325  */
1326 static void
1327 tcp_usr_abort(struct socket *so)
1328 {
1329         struct inpcb *inp;
1330         struct tcpcb *tp = NULL;
1331         struct epoch_tracker et;
1332         TCPDEBUG0;
1333
1334         inp = sotoinpcb(so);
1335         KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
1336
1337         NET_EPOCH_ENTER(et);
1338         INP_WLOCK(inp);
1339         KASSERT(inp->inp_socket != NULL,
1340             ("tcp_usr_abort: inp_socket == NULL"));
1341
1342         /*
1343          * If we still have full TCP state, and we're not dropped, drop.
1344          */
1345         if (!(inp->inp_flags & INP_TIMEWAIT) &&
1346             !(inp->inp_flags & INP_DROPPED)) {
1347                 tp = intotcpcb(inp);
1348                 TCPDEBUG1();
1349                 tp = tcp_drop(tp, ECONNABORTED);
1350                 if (tp == NULL)
1351                         goto dropped;
1352                 TCPDEBUG2(PRU_ABORT);
1353                 TCP_PROBE2(debug__user, tp, PRU_ABORT);
1354         }
1355         if (!(inp->inp_flags & INP_DROPPED)) {
1356                 SOCK_LOCK(so);
1357                 so->so_state |= SS_PROTOREF;
1358                 SOCK_UNLOCK(so);
1359                 inp->inp_flags |= INP_SOCKREF;
1360         }
1361         INP_WUNLOCK(inp);
1362 dropped:
1363         NET_EPOCH_EXIT(et);
1364 }
1365
1366 /*
1367  * TCP socket is closed.  Start friendly disconnect.
1368  */
1369 static void
1370 tcp_usr_close(struct socket *so)
1371 {
1372         struct inpcb *inp;
1373         struct tcpcb *tp = NULL;
1374         struct epoch_tracker et;
1375         TCPDEBUG0;
1376
1377         inp = sotoinpcb(so);
1378         KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
1379
1380         NET_EPOCH_ENTER(et);
1381         INP_WLOCK(inp);
1382         KASSERT(inp->inp_socket != NULL,
1383             ("tcp_usr_close: inp_socket == NULL"));
1384
1385         /*
1386          * If we still have full TCP state, and we're not dropped, initiate
1387          * a disconnect.
1388          */
1389         if (!(inp->inp_flags & INP_TIMEWAIT) &&
1390             !(inp->inp_flags & INP_DROPPED)) {
1391                 tp = intotcpcb(inp);
1392                 TCPDEBUG1();
1393                 tcp_disconnect(tp);
1394                 TCPDEBUG2(PRU_CLOSE);
1395                 TCP_PROBE2(debug__user, tp, PRU_CLOSE);
1396         }
1397         if (!(inp->inp_flags & INP_DROPPED)) {
1398                 SOCK_LOCK(so);
1399                 so->so_state |= SS_PROTOREF;
1400                 SOCK_UNLOCK(so);
1401                 inp->inp_flags |= INP_SOCKREF;
1402         }
1403         INP_WUNLOCK(inp);
1404         NET_EPOCH_EXIT(et);
1405 }
1406
1407 static int
1408 tcp_pru_options_support(struct tcpcb *tp, int flags)
1409 {
1410         /*
1411          * If the specific TCP stack has a pru_options
1412          * specified then it does not always support
1413          * all the PRU_XX options and we must ask it.
1414          * If the function is not specified then all
1415          * of the PRU_XX options are supported.
1416          */
1417         int ret = 0;
1418
1419         if (tp->t_fb->tfb_pru_options) {
1420                 ret = (*tp->t_fb->tfb_pru_options)(tp, flags);
1421         }
1422         return (ret);
1423 }
1424
1425 /*
1426  * Receive out-of-band data.
1427  */
1428 static int
1429 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
1430 {
1431         int error = 0;
1432         struct inpcb *inp;
1433         struct tcpcb *tp = NULL;
1434
1435         TCPDEBUG0;
1436         inp = sotoinpcb(so);
1437         KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
1438         INP_WLOCK(inp);
1439         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1440                 error = ECONNRESET;
1441                 goto out;
1442         }
1443         tp = intotcpcb(inp);
1444         error = tcp_pru_options_support(tp, PRUS_OOB);
1445         if (error) {
1446                 goto out;
1447         }
1448         TCPDEBUG1();
1449         if ((so->so_oobmark == 0 &&
1450              (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1451             so->so_options & SO_OOBINLINE ||
1452             tp->t_oobflags & TCPOOB_HADDATA) {
1453                 error = EINVAL;
1454                 goto out;
1455         }
1456         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1457                 error = EWOULDBLOCK;
1458                 goto out;
1459         }
1460         m->m_len = 1;
1461         *mtod(m, caddr_t) = tp->t_iobc;
1462         if ((flags & MSG_PEEK) == 0)
1463                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1464
1465 out:
1466         TCPDEBUG2(PRU_RCVOOB);
1467         TCP_PROBE2(debug__user, tp, PRU_RCVOOB);
1468         INP_WUNLOCK(inp);
1469         return (error);
1470 }
1471
1472 #ifdef INET
1473 struct pr_usrreqs tcp_usrreqs = {
1474         .pru_abort =            tcp_usr_abort,
1475         .pru_accept =           tcp_usr_accept,
1476         .pru_attach =           tcp_usr_attach,
1477         .pru_bind =             tcp_usr_bind,
1478         .pru_connect =          tcp_usr_connect,
1479         .pru_control =          in_control,
1480         .pru_detach =           tcp_usr_detach,
1481         .pru_disconnect =       tcp_usr_disconnect,
1482         .pru_listen =           tcp_usr_listen,
1483         .pru_peeraddr =         in_getpeeraddr,
1484         .pru_rcvd =             tcp_usr_rcvd,
1485         .pru_rcvoob =           tcp_usr_rcvoob,
1486         .pru_send =             tcp_usr_send,
1487         .pru_ready =            tcp_usr_ready,
1488         .pru_shutdown =         tcp_usr_shutdown,
1489         .pru_sockaddr =         in_getsockaddr,
1490         .pru_sosetlabel =       in_pcbsosetlabel,
1491         .pru_close =            tcp_usr_close,
1492 };
1493 #endif /* INET */
1494
1495 #ifdef INET6
1496 struct pr_usrreqs tcp6_usrreqs = {
1497         .pru_abort =            tcp_usr_abort,
1498         .pru_accept =           tcp6_usr_accept,
1499         .pru_attach =           tcp_usr_attach,
1500         .pru_bind =             tcp6_usr_bind,
1501         .pru_connect =          tcp6_usr_connect,
1502         .pru_control =          in6_control,
1503         .pru_detach =           tcp_usr_detach,
1504         .pru_disconnect =       tcp_usr_disconnect,
1505         .pru_listen =           tcp6_usr_listen,
1506         .pru_peeraddr =         in6_mapped_peeraddr,
1507         .pru_rcvd =             tcp_usr_rcvd,
1508         .pru_rcvoob =           tcp_usr_rcvoob,
1509         .pru_send =             tcp_usr_send,
1510         .pru_ready =            tcp_usr_ready,
1511         .pru_shutdown =         tcp_usr_shutdown,
1512         .pru_sockaddr =         in6_mapped_sockaddr,
1513         .pru_sosetlabel =       in_pcbsosetlabel,
1514         .pru_close =            tcp_usr_close,
1515 };
1516 #endif /* INET6 */
1517
1518 #ifdef INET
1519 /*
1520  * Common subroutine to open a TCP connection to remote host specified
1521  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1522  * port number if needed.  Call in_pcbconnect_setup to do the routing and
1523  * to choose a local host address (interface).  If there is an existing
1524  * incarnation of the same connection in TIME-WAIT state and if the remote
1525  * host was sending CC options and if the connection duration was < MSL, then
1526  * truncate the previous TIME-WAIT state and proceed.
1527  * Initialize connection parameters and enter SYN-SENT state.
1528  */
1529 static int
1530 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1531 {
1532         struct inpcb *inp = tp->t_inpcb, *oinp;
1533         struct socket *so = inp->inp_socket;
1534         struct in_addr laddr;
1535         u_short lport;
1536         int error;
1537
1538         NET_EPOCH_ASSERT();
1539         INP_WLOCK_ASSERT(inp);
1540         INP_HASH_WLOCK(&V_tcbinfo);
1541
1542         if (V_tcp_require_unique_port && inp->inp_lport == 0) {
1543                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1544                 if (error)
1545                         goto out;
1546         }
1547
1548         /*
1549          * Cannot simply call in_pcbconnect, because there might be an
1550          * earlier incarnation of this same connection still in
1551          * TIME_WAIT state, creating an ADDRINUSE error.
1552          */
1553         laddr = inp->inp_laddr;
1554         lport = inp->inp_lport;
1555         error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1556             &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1557         if (error && oinp == NULL)
1558                 goto out;
1559         if (oinp) {
1560                 error = EADDRINUSE;
1561                 goto out;
1562         }
1563         /* Handle initial bind if it hadn't been done in advance. */
1564         if (inp->inp_lport == 0) {
1565                 inp->inp_lport = lport;
1566                 if (in_pcbinshash(inp) != 0) {
1567                         inp->inp_lport = 0;
1568                         error = EAGAIN;
1569                         goto out;
1570                 }
1571         }
1572         inp->inp_laddr = laddr;
1573         in_pcbrehash(inp);
1574         INP_HASH_WUNLOCK(&V_tcbinfo);
1575
1576         /*
1577          * Compute window scaling to request:
1578          * Scale to fit into sweet spot.  See tcp_syncache.c.
1579          * XXX: This should move to tcp_output().
1580          */
1581         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1582             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1583                 tp->request_r_scale++;
1584
1585         soisconnecting(so);
1586         TCPSTAT_INC(tcps_connattempt);
1587         tcp_state_change(tp, TCPS_SYN_SENT);
1588         tp->iss = tcp_new_isn(&inp->inp_inc);
1589         if (tp->t_flags & TF_REQ_TSTMP)
1590                 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1591         tcp_sendseqinit(tp);
1592
1593         return 0;
1594
1595 out:
1596         INP_HASH_WUNLOCK(&V_tcbinfo);
1597         return (error);
1598 }
1599 #endif /* INET */
1600
1601 #ifdef INET6
1602 static int
1603 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1604 {
1605         struct inpcb *inp = tp->t_inpcb;
1606         int error;
1607
1608         INP_WLOCK_ASSERT(inp);
1609         INP_HASH_WLOCK(&V_tcbinfo);
1610
1611         if (V_tcp_require_unique_port && inp->inp_lport == 0) {
1612                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1613                 if (error)
1614                         goto out;
1615         }
1616         error = in6_pcbconnect(inp, nam, td->td_ucred);
1617         if (error != 0)
1618                 goto out;
1619         INP_HASH_WUNLOCK(&V_tcbinfo);
1620
1621         /* Compute window scaling to request.  */
1622         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1623             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1624                 tp->request_r_scale++;
1625
1626         soisconnecting(inp->inp_socket);
1627         TCPSTAT_INC(tcps_connattempt);
1628         tcp_state_change(tp, TCPS_SYN_SENT);
1629         tp->iss = tcp_new_isn(&inp->inp_inc);
1630         if (tp->t_flags & TF_REQ_TSTMP)
1631                 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1632         tcp_sendseqinit(tp);
1633
1634         return 0;
1635
1636 out:
1637         INP_HASH_WUNLOCK(&V_tcbinfo);
1638         return error;
1639 }
1640 #endif /* INET6 */
1641
1642 /*
1643  * Export TCP internal state information via a struct tcp_info, based on the
1644  * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
1645  * (TCP state machine, etc).  We export all information using FreeBSD-native
1646  * constants -- for example, the numeric values for tcpi_state will differ
1647  * from Linux.
1648  */
1649 static void
1650 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1651 {
1652
1653         INP_WLOCK_ASSERT(tp->t_inpcb);
1654         bzero(ti, sizeof(*ti));
1655
1656         ti->tcpi_state = tp->t_state;
1657         if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1658                 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1659         if (tp->t_flags & TF_SACK_PERMIT)
1660                 ti->tcpi_options |= TCPI_OPT_SACK;
1661         if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1662                 ti->tcpi_options |= TCPI_OPT_WSCALE;
1663                 ti->tcpi_snd_wscale = tp->snd_scale;
1664                 ti->tcpi_rcv_wscale = tp->rcv_scale;
1665         }
1666         if (tp->t_flags2 & TF2_ECN_PERMIT)
1667                 ti->tcpi_options |= TCPI_OPT_ECN;
1668
1669         ti->tcpi_rto = tp->t_rxtcur * tick;
1670         ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick;
1671         ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1672         ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1673
1674         ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1675         ti->tcpi_snd_cwnd = tp->snd_cwnd;
1676
1677         /*
1678          * FreeBSD-specific extension fields for tcp_info.
1679          */
1680         ti->tcpi_rcv_space = tp->rcv_wnd;
1681         ti->tcpi_rcv_nxt = tp->rcv_nxt;
1682         ti->tcpi_snd_wnd = tp->snd_wnd;
1683         ti->tcpi_snd_bwnd = 0;          /* Unused, kept for compat. */
1684         ti->tcpi_snd_nxt = tp->snd_nxt;
1685         ti->tcpi_snd_mss = tp->t_maxseg;
1686         ti->tcpi_rcv_mss = tp->t_maxseg;
1687         ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
1688         ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
1689         ti->tcpi_snd_zerowin = tp->t_sndzerowin;
1690 #ifdef TCP_OFFLOAD
1691         if (tp->t_flags & TF_TOE) {
1692                 ti->tcpi_options |= TCPI_OPT_TOE;
1693                 tcp_offload_tcp_info(tp, ti);
1694         }
1695 #endif
1696 }
1697
1698 /*
1699  * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1700  * socket option arguments.  When it re-acquires the lock after the copy, it
1701  * has to revalidate that the connection is still valid for the socket
1702  * option.
1703  */
1704 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do {                    \
1705         INP_WLOCK(inp);                                                 \
1706         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {            \
1707                 INP_WUNLOCK(inp);                                       \
1708                 cleanup;                                                \
1709                 return (ECONNRESET);                                    \
1710         }                                                               \
1711         tp = intotcpcb(inp);                                            \
1712 } while(0)
1713 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */)
1714
1715 static int
1716 tcp_ctloutput_set(struct inpcb *inp, struct sockopt *sopt)
1717 {
1718         struct  tcpcb *tp = intotcpcb(inp);
1719         int error = 0;
1720
1721         MPASS(sopt->sopt_dir == SOPT_SET);
1722
1723         if (sopt->sopt_level != IPPROTO_TCP) {
1724 #ifdef INET6
1725                 if (inp->inp_vflag & INP_IPV6PROTO)
1726                         error = ip6_ctloutput(inp->inp_socket, sopt);
1727 #endif
1728 #if defined(INET6) && defined(INET)
1729                 else
1730 #endif
1731 #ifdef INET
1732                         error = ip_ctloutput(inp->inp_socket, sopt);
1733 #endif
1734                 /*
1735                  * When an IP-level socket option affects TCP, pass control
1736                  * down to stack tfb_tcp_ctloutput, otherwise return what
1737                  * IP level returned.
1738                  */
1739                 switch (sopt->sopt_level) {
1740 #ifdef INET6
1741                 case IPPROTO_IPV6:
1742                         if ((inp->inp_vflag & INP_IPV6PROTO) == 0)
1743                                 return (error);
1744                         switch (sopt->sopt_name) {
1745                         case IPV6_TCLASS:
1746                                 /* Notify tcp stacks that care (e.g. RACK). */
1747                                 break;
1748                         case IPV6_USE_MIN_MTU:
1749                                 /* Update t_maxseg accordingly. */
1750                                 break;
1751                         default:
1752                                 return (error);
1753                         }
1754                         break;
1755 #endif
1756 #ifdef INET
1757                 case IPPROTO_IP:
1758                         switch (sopt->sopt_name) {
1759                         case IP_TOS:
1760                         case IP_TTL:
1761                                 /* Notify tcp stacks that care (e.g. RACK). */
1762                                 break;
1763                         default:
1764                                 return (error);
1765                         }
1766                         break;
1767 #endif
1768                 default:
1769                         return (error);
1770                 }
1771         } else if (sopt->sopt_name == TCP_FUNCTION_BLK) {
1772                 /*
1773                  * Protect the TCP option TCP_FUNCTION_BLK so
1774                  * that a sub-function can *never* overwrite this.
1775                  */
1776                 struct tcp_function_set fsn;
1777                 struct tcp_function_block *blk;
1778
1779                 error = sooptcopyin(sopt, &fsn, sizeof fsn, sizeof fsn);
1780                 if (error)
1781                         return (error);
1782
1783                 INP_WLOCK(inp);
1784                 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1785                         INP_WUNLOCK(inp);
1786                         return (ECONNRESET);
1787                 }
1788                 tp = intotcpcb(inp);
1789
1790                 blk = find_and_ref_tcp_functions(&fsn);
1791                 if (blk == NULL) {
1792                         INP_WUNLOCK(inp);
1793                         return (ENOENT);
1794                 }
1795                 if (tp->t_fb == blk) {
1796                         /* You already have this */
1797                         refcount_release(&blk->tfb_refcnt);
1798                         INP_WUNLOCK(inp);
1799                         return (0);
1800                 }
1801                 if (tp->t_state != TCPS_CLOSED) {
1802                         /*
1803                          * The user has advanced the state
1804                          * past the initial point, we may not
1805                          * be able to switch.
1806                          */
1807                         if (blk->tfb_tcp_handoff_ok != NULL) {
1808                                 /*
1809                                  * Does the stack provide a
1810                                  * query mechanism, if so it may
1811                                  * still be possible?
1812                                  */
1813                                 error = (*blk->tfb_tcp_handoff_ok)(tp);
1814                         } else
1815                                 error = EINVAL;
1816                         if (error) {
1817                                 refcount_release(&blk->tfb_refcnt);
1818                                 INP_WUNLOCK(inp);
1819                                 return(error);
1820                         }
1821                 }
1822                 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
1823                         refcount_release(&blk->tfb_refcnt);
1824                         INP_WUNLOCK(inp);
1825                         return (ENOENT);
1826                 }
1827                 /*
1828                  * Release the old refcnt, the
1829                  * lookup acquired a ref on the
1830                  * new one already.
1831                  */
1832                 if (tp->t_fb->tfb_tcp_fb_fini) {
1833                         struct epoch_tracker et;
1834                         /*
1835                          * Tell the stack to cleanup with 0 i.e.
1836                          * the tcb is not going away.
1837                          */
1838                         NET_EPOCH_ENTER(et);
1839                         (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
1840                         NET_EPOCH_EXIT(et);
1841                 }
1842 #ifdef TCPHPTS
1843                 /* Assure that we are not on any hpts */
1844                 tcp_hpts_remove(tp->t_inpcb);
1845 #endif
1846                 if (blk->tfb_tcp_fb_init) {
1847                         error = (*blk->tfb_tcp_fb_init)(tp);
1848                         if (error) {
1849                                 refcount_release(&blk->tfb_refcnt);
1850                                 if (tp->t_fb->tfb_tcp_fb_init) {
1851                                         if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0)  {
1852                                                 /* Fall back failed, drop the connection */
1853                                                 INP_WUNLOCK(inp);
1854                                                 soabort(inp->inp_socket);
1855                                                 return(error);
1856                                         }
1857                                 }
1858                                 goto err_out;
1859                         }
1860                 }
1861                 refcount_release(&tp->t_fb->tfb_refcnt);
1862                 tp->t_fb = blk;
1863 #ifdef TCP_OFFLOAD
1864                 if (tp->t_flags & TF_TOE) {
1865                         tcp_offload_ctloutput(tp, sopt->sopt_dir,
1866                              sopt->sopt_name);
1867                 }
1868 #endif
1869 err_out:
1870                 INP_WUNLOCK(inp);
1871                 return (error);
1872         }
1873
1874         INP_WLOCK(inp);
1875         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1876                 INP_WUNLOCK(inp);
1877                 return (ECONNRESET);
1878         }
1879         tp = intotcpcb(inp);
1880
1881         /* Pass in the INP locked, caller must unlock it. */
1882         return (tp->t_fb->tfb_tcp_ctloutput(inp->inp_socket, sopt, inp, tp));
1883 }
1884
1885 static int
1886 tcp_ctloutput_get(struct inpcb *inp, struct sockopt *sopt)
1887 {
1888         int     error = 0;
1889         struct  tcpcb *tp;
1890
1891         MPASS(sopt->sopt_dir == SOPT_GET);
1892
1893         if (sopt->sopt_level != IPPROTO_TCP) {
1894 #ifdef INET6
1895                 if (inp->inp_vflag & INP_IPV6PROTO)
1896                         error = ip6_ctloutput(inp->inp_socket, sopt);
1897 #endif /* INET6 */
1898 #if defined(INET6) && defined(INET)
1899                 else
1900 #endif
1901 #ifdef INET
1902                         error = ip_ctloutput(inp->inp_socket, sopt);
1903 #endif
1904                 return (error);
1905         }
1906         INP_WLOCK(inp);
1907         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1908                 INP_WUNLOCK(inp);
1909                 return (ECONNRESET);
1910         }
1911         tp = intotcpcb(inp);
1912         if (((sopt->sopt_name == TCP_FUNCTION_BLK) ||
1913              (sopt->sopt_name == TCP_FUNCTION_ALIAS))) {
1914                 struct tcp_function_set fsn;
1915
1916                 if (sopt->sopt_name == TCP_FUNCTION_ALIAS) {
1917                         memset(&fsn, 0, sizeof(fsn));
1918                         find_tcp_function_alias(tp->t_fb, &fsn);
1919                 } else {
1920                         strncpy(fsn.function_set_name,
1921                             tp->t_fb->tfb_tcp_block_name,
1922                             TCP_FUNCTION_NAME_LEN_MAX);
1923                         fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
1924                 }
1925                 fsn.pcbcnt = tp->t_fb->tfb_refcnt;
1926                 INP_WUNLOCK(inp);
1927                 error = sooptcopyout(sopt, &fsn, sizeof fsn);
1928                 return (error);
1929         }
1930
1931         /* Pass in the INP locked, caller must unlock it. */
1932         return (tp->t_fb->tfb_tcp_ctloutput(inp->inp_socket, sopt, inp, tp));
1933 }
1934
1935 int
1936 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1937 {
1938         struct  inpcb *inp;
1939
1940         inp = sotoinpcb(so);
1941         KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1942
1943         if (sopt->sopt_dir == SOPT_SET)
1944                 return (tcp_ctloutput_set(inp, sopt));
1945         else if (sopt->sopt_dir == SOPT_GET)
1946                 return (tcp_ctloutput_get(inp, sopt));
1947         else
1948                 panic("%s: sopt_dir $%d", __func__, sopt->sopt_dir);
1949 }
1950
1951 /*
1952  * If this assert becomes untrue, we need to change the size of the buf
1953  * variable in tcp_default_ctloutput().
1954  */
1955 #ifdef CTASSERT
1956 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN);
1957 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN);
1958 #endif
1959
1960 #ifdef KERN_TLS
1961 static int
1962 copyin_tls_enable(struct sockopt *sopt, struct tls_enable *tls)
1963 {
1964         struct tls_enable_v0 tls_v0;
1965         int error;
1966
1967         if (sopt->sopt_valsize == sizeof(tls_v0)) {
1968                 error = sooptcopyin(sopt, &tls_v0, sizeof(tls_v0),
1969                     sizeof(tls_v0));
1970                 if (error)
1971                         return (error);
1972                 memset(tls, 0, sizeof(*tls));
1973                 tls->cipher_key = tls_v0.cipher_key;
1974                 tls->iv = tls_v0.iv;
1975                 tls->auth_key = tls_v0.auth_key;
1976                 tls->cipher_algorithm = tls_v0.cipher_algorithm;
1977                 tls->cipher_key_len = tls_v0.cipher_key_len;
1978                 tls->iv_len = tls_v0.iv_len;
1979                 tls->auth_algorithm = tls_v0.auth_algorithm;
1980                 tls->auth_key_len = tls_v0.auth_key_len;
1981                 tls->flags = tls_v0.flags;
1982                 tls->tls_vmajor = tls_v0.tls_vmajor;
1983                 tls->tls_vminor = tls_v0.tls_vminor;
1984                 return (0);
1985         }
1986
1987         return (sooptcopyin(sopt, tls, sizeof(*tls), sizeof(*tls)));
1988 }
1989 #endif
1990
1991 extern struct cc_algo newreno_cc_algo;
1992
1993 static int
1994 tcp_congestion(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp)
1995 {
1996         struct cc_algo *algo;
1997         void *ptr = NULL;
1998         struct cc_var cc_mem;
1999         char    buf[TCP_CA_NAME_MAX];
2000         size_t mem_sz;
2001         int error;
2002
2003         INP_WUNLOCK(inp);
2004         error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1);
2005         if (error)
2006                 return(error);
2007         buf[sopt->sopt_valsize] = '\0';
2008         CC_LIST_RLOCK();
2009         STAILQ_FOREACH(algo, &cc_list, entries)
2010                 if (strncmp(buf, algo->name,
2011                             TCP_CA_NAME_MAX) == 0) {
2012                         if (algo->flags & CC_MODULE_BEING_REMOVED) {
2013                                 /* We can't "see" modules being unloaded */
2014                                 continue;
2015                         }
2016                         break;
2017                 }
2018         if (algo == NULL) {
2019                 CC_LIST_RUNLOCK();
2020                 return(ESRCH);
2021         }
2022 do_over:
2023         if (algo->cb_init != NULL) {
2024                 /* We can now pre-get the memory for the CC */
2025                 mem_sz = (*algo->cc_data_sz)();
2026                 if (mem_sz == 0) {
2027                         goto no_mem_needed;
2028                 }
2029                 CC_LIST_RUNLOCK();
2030                 ptr = malloc(mem_sz, M_CC_MEM, M_WAITOK);
2031                 CC_LIST_RLOCK();
2032                 STAILQ_FOREACH(algo, &cc_list, entries)
2033                         if (strncmp(buf, algo->name,
2034                                     TCP_CA_NAME_MAX) == 0)
2035                                 break;
2036                 if (algo == NULL) {
2037                         if (ptr)
2038                                 free(ptr, M_CC_MEM);
2039                         CC_LIST_RUNLOCK();
2040                         return(ESRCH);
2041                 }
2042         } else {
2043 no_mem_needed:
2044                 mem_sz = 0;
2045                 ptr = NULL;
2046         }
2047         /*
2048          * Make sure its all clean and zero and also get
2049          * back the inplock.
2050          */
2051         memset(&cc_mem, 0, sizeof(cc_mem));
2052         if (mem_sz != (*algo->cc_data_sz)()) {
2053                 if (ptr)
2054                         free(ptr, M_CC_MEM);
2055                 goto do_over;
2056         }
2057         INP_WLOCK(inp);
2058         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
2059                 INP_WUNLOCK(inp);
2060                 CC_LIST_RUNLOCK();
2061                 free(ptr, M_CC_MEM);
2062                 return (ECONNRESET);
2063         }
2064         tp = intotcpcb(inp);
2065         if (ptr != NULL)
2066                 memset(ptr, 0, mem_sz);
2067         CC_LIST_RUNLOCK();
2068         cc_mem.ccvc.tcp = tp;
2069         /*
2070          * We once again hold a write lock over the tcb so it's
2071          * safe to do these things without ordering concerns.
2072          * Note here we init into stack memory.
2073          */
2074         if (algo->cb_init != NULL)
2075                 error = algo->cb_init(&cc_mem, ptr);
2076         else
2077                 error = 0;
2078         /*
2079          * The CC algorithms, when given their memory
2080          * should not fail we could in theory have a
2081          * KASSERT here.
2082          */
2083         if (error == 0) {
2084                 /*
2085                  * Touchdown, lets go ahead and move the
2086                  * connection to the new CC module by
2087                  * copying in the cc_mem after we call
2088                  * the old ones cleanup (if any).
2089                  */
2090                 if (CC_ALGO(tp)->cb_destroy != NULL)
2091                         CC_ALGO(tp)->cb_destroy(tp->ccv);
2092                 memcpy(tp->ccv, &cc_mem, sizeof(struct cc_var));
2093                 tp->cc_algo = algo;
2094                 /* Ok now are we where we have gotten past any conn_init? */
2095                 if (TCPS_HAVEESTABLISHED(tp->t_state) && (CC_ALGO(tp)->conn_init != NULL)) {
2096                         /* Yep run the connection init for the new CC */
2097                         CC_ALGO(tp)->conn_init(tp->ccv);
2098                 }
2099         } else if (ptr)
2100                 free(ptr, M_CC_MEM);
2101         INP_WUNLOCK(inp);
2102         return (error);
2103 }
2104
2105 int
2106 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp)
2107 {
2108         int     error, opt, optval;
2109         u_int   ui;
2110         struct  tcp_info ti;
2111 #ifdef KERN_TLS
2112         struct tls_enable tls;
2113 #endif
2114         char    *pbuf, buf[TCP_LOG_ID_LEN];
2115 #ifdef STATS
2116         struct statsblob *sbp;
2117 #endif
2118         size_t  len;
2119
2120         INP_WLOCK_ASSERT(inp);
2121
2122         switch (sopt->sopt_level) {
2123 #ifdef INET6
2124         case IPPROTO_IPV6:
2125                 MPASS(inp->inp_vflag & INP_IPV6PROTO);
2126                 switch (sopt->sopt_name) {
2127                 case IPV6_USE_MIN_MTU:
2128                         tcp6_use_min_mtu(tp);
2129                         /* FALLTHROUGH */
2130                 }
2131                 INP_WUNLOCK(inp);
2132                 return (0);
2133 #endif
2134 #ifdef INET
2135         case IPPROTO_IP:
2136                 INP_WUNLOCK(inp);
2137                 return (0);
2138 #endif
2139         }
2140
2141         /*
2142          * For TCP_CCALGOOPT forward the control to CC module, for both
2143          * SOPT_SET and SOPT_GET.
2144          */
2145         switch (sopt->sopt_name) {
2146         case TCP_CCALGOOPT:
2147                 INP_WUNLOCK(inp);
2148                 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT)
2149                         return (EINVAL);
2150                 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO);
2151                 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize,
2152                     sopt->sopt_valsize);
2153                 if (error) {
2154                         free(pbuf, M_TEMP);
2155                         return (error);
2156                 }
2157                 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP));
2158                 if (CC_ALGO(tp)->ctl_output != NULL)
2159                         error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf);
2160                 else
2161                         error = ENOENT;
2162                 INP_WUNLOCK(inp);
2163                 if (error == 0 && sopt->sopt_dir == SOPT_GET)
2164                         error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize);
2165                 free(pbuf, M_TEMP);
2166                 return (error);
2167         }
2168
2169         switch (sopt->sopt_dir) {
2170         case SOPT_SET:
2171                 switch (sopt->sopt_name) {
2172 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2173                 case TCP_MD5SIG:
2174                         if (!TCPMD5_ENABLED()) {
2175                                 INP_WUNLOCK(inp);
2176                                 return (ENOPROTOOPT);
2177                         }
2178                         error = TCPMD5_PCBCTL(inp, sopt);
2179                         if (error)
2180                                 return (error);
2181                         goto unlock_and_done;
2182 #endif /* IPSEC */
2183
2184                 case TCP_NODELAY:
2185                 case TCP_NOOPT:
2186                 case TCP_LRD:
2187                         INP_WUNLOCK(inp);
2188                         error = sooptcopyin(sopt, &optval, sizeof optval,
2189                             sizeof optval);
2190                         if (error)
2191                                 return (error);
2192
2193                         INP_WLOCK_RECHECK(inp);
2194                         switch (sopt->sopt_name) {
2195                         case TCP_NODELAY:
2196                                 opt = TF_NODELAY;
2197                                 break;
2198                         case TCP_NOOPT:
2199                                 opt = TF_NOOPT;
2200                                 break;
2201                         case TCP_LRD:
2202                                 opt = TF_LRD;
2203                                 break;
2204                         default:
2205                                 opt = 0; /* dead code to fool gcc */
2206                                 break;
2207                         }
2208
2209                         if (optval)
2210                                 tp->t_flags |= opt;
2211                         else
2212                                 tp->t_flags &= ~opt;
2213 unlock_and_done:
2214 #ifdef TCP_OFFLOAD
2215                         if (tp->t_flags & TF_TOE) {
2216                                 tcp_offload_ctloutput(tp, sopt->sopt_dir,
2217                                     sopt->sopt_name);
2218                         }
2219 #endif
2220                         INP_WUNLOCK(inp);
2221                         break;
2222
2223                 case TCP_NOPUSH:
2224                         INP_WUNLOCK(inp);
2225                         error = sooptcopyin(sopt, &optval, sizeof optval,
2226                             sizeof optval);
2227                         if (error)
2228                                 return (error);
2229
2230                         INP_WLOCK_RECHECK(inp);
2231                         if (optval)
2232                                 tp->t_flags |= TF_NOPUSH;
2233                         else if (tp->t_flags & TF_NOPUSH) {
2234                                 tp->t_flags &= ~TF_NOPUSH;
2235                                 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
2236                                         struct epoch_tracker et;
2237
2238                                         NET_EPOCH_ENTER(et);
2239                                         error = tcp_output_nodrop(tp);
2240                                         NET_EPOCH_EXIT(et);
2241                                 }
2242                         }
2243                         goto unlock_and_done;
2244
2245                 case TCP_REMOTE_UDP_ENCAPS_PORT:
2246                         INP_WUNLOCK(inp);
2247                         error = sooptcopyin(sopt, &optval, sizeof optval,
2248                             sizeof optval);
2249                         if (error)
2250                                 return (error);
2251                         if ((optval < TCP_TUNNELING_PORT_MIN) ||
2252                             (optval > TCP_TUNNELING_PORT_MAX)) {
2253                                 /* Its got to be in range */
2254                                 return (EINVAL);
2255                         }
2256                         if ((V_tcp_udp_tunneling_port == 0) && (optval != 0)) {
2257                                 /* You have to have enabled a UDP tunneling port first */
2258                                 return (EINVAL);
2259                         }
2260                         INP_WLOCK_RECHECK(inp);
2261                         if (tp->t_state != TCPS_CLOSED) {
2262                                 /* You can't change after you are connected */
2263                                 error = EINVAL;
2264                         } else {
2265                                 /* Ok we are all good set the port */
2266                                 tp->t_port = htons(optval);
2267                         }
2268                         goto unlock_and_done;
2269
2270                 case TCP_MAXSEG:
2271                         INP_WUNLOCK(inp);
2272                         error = sooptcopyin(sopt, &optval, sizeof optval,
2273                             sizeof optval);
2274                         if (error)
2275                                 return (error);
2276
2277                         INP_WLOCK_RECHECK(inp);
2278                         if (optval > 0 && optval <= tp->t_maxseg &&
2279                             optval + 40 >= V_tcp_minmss)
2280                                 tp->t_maxseg = optval;
2281                         else
2282                                 error = EINVAL;
2283                         goto unlock_and_done;
2284
2285                 case TCP_INFO:
2286                         INP_WUNLOCK(inp);
2287                         error = EINVAL;
2288                         break;
2289
2290                 case TCP_STATS:
2291                         INP_WUNLOCK(inp);
2292 #ifdef STATS
2293                         error = sooptcopyin(sopt, &optval, sizeof optval,
2294                             sizeof optval);
2295                         if (error)
2296                                 return (error);
2297
2298                         if (optval > 0)
2299                                 sbp = stats_blob_alloc(
2300                                     V_tcp_perconn_stats_dflt_tpl, 0);
2301                         else
2302                                 sbp = NULL;
2303
2304                         INP_WLOCK_RECHECK(inp);
2305                         if ((tp->t_stats != NULL && sbp == NULL) ||
2306                             (tp->t_stats == NULL && sbp != NULL)) {
2307                                 struct statsblob *t = tp->t_stats;
2308                                 tp->t_stats = sbp;
2309                                 sbp = t;
2310                         }
2311                         INP_WUNLOCK(inp);
2312
2313                         stats_blob_destroy(sbp);
2314 #else
2315                         return (EOPNOTSUPP);
2316 #endif /* !STATS */
2317                         break;
2318
2319                 case TCP_CONGESTION:
2320                         error = tcp_congestion(so, sopt, inp, tp);
2321                         break;
2322
2323                 case TCP_REUSPORT_LB_NUMA:
2324                         INP_WUNLOCK(inp);
2325                         error = sooptcopyin(sopt, &optval, sizeof(optval),
2326                             sizeof(optval));
2327                         INP_WLOCK_RECHECK(inp);
2328                         if (!error)
2329                                 error = in_pcblbgroup_numa(inp, optval);
2330                         INP_WUNLOCK(inp);
2331                         break;
2332
2333 #ifdef KERN_TLS
2334                 case TCP_TXTLS_ENABLE:
2335                         INP_WUNLOCK(inp);
2336                         error = copyin_tls_enable(sopt, &tls);
2337                         if (error)
2338                                 break;
2339                         error = ktls_enable_tx(so, &tls);
2340                         break;
2341                 case TCP_TXTLS_MODE:
2342                         INP_WUNLOCK(inp);
2343                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2344                         if (error)
2345                                 return (error);
2346
2347                         INP_WLOCK_RECHECK(inp);
2348                         error = ktls_set_tx_mode(so, ui);
2349                         INP_WUNLOCK(inp);
2350                         break;
2351                 case TCP_RXTLS_ENABLE:
2352                         INP_WUNLOCK(inp);
2353                         error = sooptcopyin(sopt, &tls, sizeof(tls),
2354                             sizeof(tls));
2355                         if (error)
2356                                 break;
2357                         error = ktls_enable_rx(so, &tls);
2358                         break;
2359 #endif
2360
2361                 case TCP_KEEPIDLE:
2362                 case TCP_KEEPINTVL:
2363                 case TCP_KEEPINIT:
2364                         INP_WUNLOCK(inp);
2365                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2366                         if (error)
2367                                 return (error);
2368
2369                         if (ui > (UINT_MAX / hz)) {
2370                                 error = EINVAL;
2371                                 break;
2372                         }
2373                         ui *= hz;
2374
2375                         INP_WLOCK_RECHECK(inp);
2376                         switch (sopt->sopt_name) {
2377                         case TCP_KEEPIDLE:
2378                                 tp->t_keepidle = ui;
2379                                 /*
2380                                  * XXX: better check current remaining
2381                                  * timeout and "merge" it with new value.
2382                                  */
2383                                 if ((tp->t_state > TCPS_LISTEN) &&
2384                                     (tp->t_state <= TCPS_CLOSING))
2385                                         tcp_timer_activate(tp, TT_KEEP,
2386                                             TP_KEEPIDLE(tp));
2387                                 break;
2388                         case TCP_KEEPINTVL:
2389                                 tp->t_keepintvl = ui;
2390                                 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2391                                     (TP_MAXIDLE(tp) > 0))
2392                                         tcp_timer_activate(tp, TT_2MSL,
2393                                             TP_MAXIDLE(tp));
2394                                 break;
2395                         case TCP_KEEPINIT:
2396                                 tp->t_keepinit = ui;
2397                                 if (tp->t_state == TCPS_SYN_RECEIVED ||
2398                                     tp->t_state == TCPS_SYN_SENT)
2399                                         tcp_timer_activate(tp, TT_KEEP,
2400                                             TP_KEEPINIT(tp));
2401                                 break;
2402                         }
2403                         goto unlock_and_done;
2404
2405                 case TCP_KEEPCNT:
2406                         INP_WUNLOCK(inp);
2407                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2408                         if (error)
2409                                 return (error);
2410
2411                         INP_WLOCK_RECHECK(inp);
2412                         tp->t_keepcnt = ui;
2413                         if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2414                             (TP_MAXIDLE(tp) > 0))
2415                                 tcp_timer_activate(tp, TT_2MSL,
2416                                     TP_MAXIDLE(tp));
2417                         goto unlock_and_done;
2418
2419 #ifdef TCPPCAP
2420                 case TCP_PCAP_OUT:
2421                 case TCP_PCAP_IN:
2422                         INP_WUNLOCK(inp);
2423                         error = sooptcopyin(sopt, &optval, sizeof optval,
2424                             sizeof optval);
2425                         if (error)
2426                                 return (error);
2427
2428                         INP_WLOCK_RECHECK(inp);
2429                         if (optval >= 0)
2430                                 tcp_pcap_set_sock_max(TCP_PCAP_OUT ?
2431                                         &(tp->t_outpkts) : &(tp->t_inpkts),
2432                                         optval);
2433                         else
2434                                 error = EINVAL;
2435                         goto unlock_and_done;
2436 #endif
2437
2438                 case TCP_FASTOPEN: {
2439                         struct tcp_fastopen tfo_optval;
2440
2441                         INP_WUNLOCK(inp);
2442                         if (!V_tcp_fastopen_client_enable &&
2443                             !V_tcp_fastopen_server_enable)
2444                                 return (EPERM);
2445
2446                         error = sooptcopyin(sopt, &tfo_optval,
2447                                     sizeof(tfo_optval), sizeof(int));
2448                         if (error)
2449                                 return (error);
2450
2451                         INP_WLOCK_RECHECK(inp);
2452                         if ((tp->t_state != TCPS_CLOSED) &&
2453                             (tp->t_state != TCPS_LISTEN)) {
2454                                 error = EINVAL;
2455                                 goto unlock_and_done;
2456                         }
2457                         if (tfo_optval.enable) {
2458                                 if (tp->t_state == TCPS_LISTEN) {
2459                                         if (!V_tcp_fastopen_server_enable) {
2460                                                 error = EPERM;
2461                                                 goto unlock_and_done;
2462                                         }
2463
2464                                         if (tp->t_tfo_pending == NULL)
2465                                                 tp->t_tfo_pending =
2466                                                     tcp_fastopen_alloc_counter();
2467                                 } else {
2468                                         /*
2469                                          * If a pre-shared key was provided,
2470                                          * stash it in the client cookie
2471                                          * field of the tcpcb for use during
2472                                          * connect.
2473                                          */
2474                                         if (sopt->sopt_valsize ==
2475                                             sizeof(tfo_optval)) {
2476                                                 memcpy(tp->t_tfo_cookie.client,
2477                                                        tfo_optval.psk,
2478                                                        TCP_FASTOPEN_PSK_LEN);
2479                                                 tp->t_tfo_client_cookie_len =
2480                                                     TCP_FASTOPEN_PSK_LEN;
2481                                         }
2482                                 }
2483                                 tp->t_flags |= TF_FASTOPEN;
2484                         } else
2485                                 tp->t_flags &= ~TF_FASTOPEN;
2486                         goto unlock_and_done;
2487                 }
2488
2489 #ifdef TCP_BLACKBOX
2490                 case TCP_LOG:
2491                         INP_WUNLOCK(inp);
2492                         error = sooptcopyin(sopt, &optval, sizeof optval,
2493                             sizeof optval);
2494                         if (error)
2495                                 return (error);
2496
2497                         INP_WLOCK_RECHECK(inp);
2498                         error = tcp_log_state_change(tp, optval);
2499                         goto unlock_and_done;
2500
2501                 case TCP_LOGBUF:
2502                         INP_WUNLOCK(inp);
2503                         error = EINVAL;
2504                         break;
2505
2506                 case TCP_LOGID:
2507                         INP_WUNLOCK(inp);
2508                         error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0);
2509                         if (error)
2510                                 break;
2511                         buf[sopt->sopt_valsize] = '\0';
2512                         INP_WLOCK_RECHECK(inp);
2513                         error = tcp_log_set_id(tp, buf);
2514                         /* tcp_log_set_id() unlocks the INP. */
2515                         break;
2516
2517                 case TCP_LOGDUMP:
2518                 case TCP_LOGDUMPID:
2519                         INP_WUNLOCK(inp);
2520                         error =
2521                             sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0);
2522                         if (error)
2523                                 break;
2524                         buf[sopt->sopt_valsize] = '\0';
2525                         INP_WLOCK_RECHECK(inp);
2526                         if (sopt->sopt_name == TCP_LOGDUMP) {
2527                                 error = tcp_log_dump_tp_logbuf(tp, buf,
2528                                     M_WAITOK, true);
2529                                 INP_WUNLOCK(inp);
2530                         } else {
2531                                 tcp_log_dump_tp_bucket_logbufs(tp, buf);
2532                                 /*
2533                                  * tcp_log_dump_tp_bucket_logbufs() drops the
2534                                  * INP lock.
2535                                  */
2536                         }
2537                         break;
2538 #endif
2539
2540                 default:
2541                         INP_WUNLOCK(inp);
2542                         error = ENOPROTOOPT;
2543                         break;
2544                 }
2545                 break;
2546
2547         case SOPT_GET:
2548                 tp = intotcpcb(inp);
2549                 switch (sopt->sopt_name) {
2550 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2551                 case TCP_MD5SIG:
2552                         if (!TCPMD5_ENABLED()) {
2553                                 INP_WUNLOCK(inp);
2554                                 return (ENOPROTOOPT);
2555                         }
2556                         error = TCPMD5_PCBCTL(inp, sopt);
2557                         break;
2558 #endif
2559
2560                 case TCP_NODELAY:
2561                         optval = tp->t_flags & TF_NODELAY;
2562                         INP_WUNLOCK(inp);
2563                         error = sooptcopyout(sopt, &optval, sizeof optval);
2564                         break;
2565                 case TCP_MAXSEG:
2566                         optval = tp->t_maxseg;
2567                         INP_WUNLOCK(inp);
2568                         error = sooptcopyout(sopt, &optval, sizeof optval);
2569                         break;
2570                 case TCP_REMOTE_UDP_ENCAPS_PORT:
2571                         optval = ntohs(tp->t_port);
2572                         INP_WUNLOCK(inp);
2573                         error = sooptcopyout(sopt, &optval, sizeof optval);
2574                         break;
2575                 case TCP_NOOPT:
2576                         optval = tp->t_flags & TF_NOOPT;
2577                         INP_WUNLOCK(inp);
2578                         error = sooptcopyout(sopt, &optval, sizeof optval);
2579                         break;
2580                 case TCP_NOPUSH:
2581                         optval = tp->t_flags & TF_NOPUSH;
2582                         INP_WUNLOCK(inp);
2583                         error = sooptcopyout(sopt, &optval, sizeof optval);
2584                         break;
2585                 case TCP_INFO:
2586                         tcp_fill_info(tp, &ti);
2587                         INP_WUNLOCK(inp);
2588                         error = sooptcopyout(sopt, &ti, sizeof ti);
2589                         break;
2590                 case TCP_STATS:
2591                         {
2592 #ifdef STATS
2593                         int nheld;
2594                         TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0;
2595
2596                         error = 0;
2597                         socklen_t outsbsz = sopt->sopt_valsize;
2598                         if (tp->t_stats == NULL)
2599                                 error = ENOENT;
2600                         else if (outsbsz >= tp->t_stats->cursz)
2601                                 outsbsz = tp->t_stats->cursz;
2602                         else if (outsbsz >= sizeof(struct statsblob))
2603                                 outsbsz = sizeof(struct statsblob);
2604                         else
2605                                 error = EINVAL;
2606                         INP_WUNLOCK(inp);
2607                         if (error)
2608                                 break;
2609
2610                         sbp = sopt->sopt_val;
2611                         nheld = atop(round_page(((vm_offset_t)sbp) +
2612                             (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp));
2613                         vm_page_t ma[nheld];
2614                         if (vm_fault_quick_hold_pages(
2615                             &curproc->p_vmspace->vm_map, (vm_offset_t)sbp,
2616                             outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma,
2617                             nheld) < 0) {
2618                                 error = EFAULT;
2619                                 break;
2620                         }
2621
2622                         if ((error = copyin_nofault(&(sbp->flags), &sbflags,
2623                             SIZEOF_MEMBER(struct statsblob, flags))))
2624                                 goto unhold;
2625
2626                         INP_WLOCK_RECHECK(inp);
2627                         error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats,
2628                             sbflags | SB_CLONE_USRDSTNOFAULT);
2629                         INP_WUNLOCK(inp);
2630                         sopt->sopt_valsize = outsbsz;
2631 unhold:
2632                         vm_page_unhold_pages(ma, nheld);
2633 #else
2634                         INP_WUNLOCK(inp);
2635                         error = EOPNOTSUPP;
2636 #endif /* !STATS */
2637                         break;
2638                         }
2639                 case TCP_CONGESTION:
2640                         len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
2641                         INP_WUNLOCK(inp);
2642                         error = sooptcopyout(sopt, buf, len + 1);
2643                         break;
2644                 case TCP_KEEPIDLE:
2645                 case TCP_KEEPINTVL:
2646                 case TCP_KEEPINIT:
2647                 case TCP_KEEPCNT:
2648                         switch (sopt->sopt_name) {
2649                         case TCP_KEEPIDLE:
2650                                 ui = TP_KEEPIDLE(tp) / hz;
2651                                 break;
2652                         case TCP_KEEPINTVL:
2653                                 ui = TP_KEEPINTVL(tp) / hz;
2654                                 break;
2655                         case TCP_KEEPINIT:
2656                                 ui = TP_KEEPINIT(tp) / hz;
2657                                 break;
2658                         case TCP_KEEPCNT:
2659                                 ui = TP_KEEPCNT(tp);
2660                                 break;
2661                         }
2662                         INP_WUNLOCK(inp);
2663                         error = sooptcopyout(sopt, &ui, sizeof(ui));
2664                         break;
2665 #ifdef TCPPCAP
2666                 case TCP_PCAP_OUT:
2667                 case TCP_PCAP_IN:
2668                         optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ?
2669                                         &(tp->t_outpkts) : &(tp->t_inpkts));
2670                         INP_WUNLOCK(inp);
2671                         error = sooptcopyout(sopt, &optval, sizeof optval);
2672                         break;
2673 #endif
2674                 case TCP_FASTOPEN:
2675                         optval = tp->t_flags & TF_FASTOPEN;
2676                         INP_WUNLOCK(inp);
2677                         error = sooptcopyout(sopt, &optval, sizeof optval);
2678                         break;
2679 #ifdef TCP_BLACKBOX
2680                 case TCP_LOG:
2681                         optval = tp->t_logstate;
2682                         INP_WUNLOCK(inp);
2683                         error = sooptcopyout(sopt, &optval, sizeof(optval));
2684                         break;
2685                 case TCP_LOGBUF:
2686                         /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */
2687                         error = tcp_log_getlogbuf(sopt, tp);
2688                         break;
2689                 case TCP_LOGID:
2690                         len = tcp_log_get_id(tp, buf);
2691                         INP_WUNLOCK(inp);
2692                         error = sooptcopyout(sopt, buf, len + 1);
2693                         break;
2694                 case TCP_LOGDUMP:
2695                 case TCP_LOGDUMPID:
2696                         INP_WUNLOCK(inp);
2697                         error = EINVAL;
2698                         break;
2699 #endif
2700 #ifdef KERN_TLS
2701                 case TCP_TXTLS_MODE:
2702                         error = ktls_get_tx_mode(so, &optval);
2703                         INP_WUNLOCK(inp);
2704                         if (error == 0)
2705                                 error = sooptcopyout(sopt, &optval,
2706                                     sizeof(optval));
2707                         break;
2708                 case TCP_RXTLS_MODE:
2709                         error = ktls_get_rx_mode(so, &optval);
2710                         INP_WUNLOCK(inp);
2711                         if (error == 0)
2712                                 error = sooptcopyout(sopt, &optval,
2713                                     sizeof(optval));
2714                         break;
2715 #endif
2716                 case TCP_LRD:
2717                         optval = tp->t_flags & TF_LRD;
2718                         INP_WUNLOCK(inp);
2719                         error = sooptcopyout(sopt, &optval, sizeof optval);
2720                         break;
2721                 default:
2722                         INP_WUNLOCK(inp);
2723                         error = ENOPROTOOPT;
2724                         break;
2725                 }
2726                 break;
2727         }
2728         return (error);
2729 }
2730 #undef INP_WLOCK_RECHECK
2731 #undef INP_WLOCK_RECHECK_CLEANUP
2732
2733 /*
2734  * Initiate (or continue) disconnect.
2735  * If embryonic state, just send reset (once).
2736  * If in ``let data drain'' option and linger null, just drop.
2737  * Otherwise (hard), mark socket disconnecting and drop
2738  * current input data; switch states based on user close, and
2739  * send segment to peer (with FIN).
2740  */
2741 static void
2742 tcp_disconnect(struct tcpcb *tp)
2743 {
2744         struct inpcb *inp = tp->t_inpcb;
2745         struct socket *so = inp->inp_socket;
2746
2747         NET_EPOCH_ASSERT();
2748         INP_WLOCK_ASSERT(inp);
2749
2750         /*
2751          * Neither tcp_close() nor tcp_drop() should return NULL, as the
2752          * socket is still open.
2753          */
2754         if (tp->t_state < TCPS_ESTABLISHED &&
2755             !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) {
2756                 tp = tcp_close(tp);
2757                 KASSERT(tp != NULL,
2758                     ("tcp_disconnect: tcp_close() returned NULL"));
2759         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
2760                 tp = tcp_drop(tp, 0);
2761                 KASSERT(tp != NULL,
2762                     ("tcp_disconnect: tcp_drop() returned NULL"));
2763         } else {
2764                 soisdisconnecting(so);
2765                 sbflush(&so->so_rcv);
2766                 tcp_usrclosed(tp);
2767                 if (!(inp->inp_flags & INP_DROPPED))
2768                         /* Ignore stack's drop request, we already at it. */
2769                         (void)tcp_output_nodrop(tp);
2770         }
2771 }
2772
2773 /*
2774  * User issued close, and wish to trail through shutdown states:
2775  * if never received SYN, just forget it.  If got a SYN from peer,
2776  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
2777  * If already got a FIN from peer, then almost done; go to LAST_ACK
2778  * state.  In all other cases, have already sent FIN to peer (e.g.
2779  * after PRU_SHUTDOWN), and just have to play tedious game waiting
2780  * for peer to send FIN or not respond to keep-alives, etc.
2781  * We can let the user exit from the close as soon as the FIN is acked.
2782  */
2783 static void
2784 tcp_usrclosed(struct tcpcb *tp)
2785 {
2786
2787         NET_EPOCH_ASSERT();
2788         INP_WLOCK_ASSERT(tp->t_inpcb);
2789
2790         switch (tp->t_state) {
2791         case TCPS_LISTEN:
2792 #ifdef TCP_OFFLOAD
2793                 tcp_offload_listen_stop(tp);
2794 #endif
2795                 tcp_state_change(tp, TCPS_CLOSED);
2796                 /* FALLTHROUGH */
2797         case TCPS_CLOSED:
2798                 tp = tcp_close(tp);
2799                 /*
2800                  * tcp_close() should never return NULL here as the socket is
2801                  * still open.
2802                  */
2803                 KASSERT(tp != NULL,
2804                     ("tcp_usrclosed: tcp_close() returned NULL"));
2805                 break;
2806
2807         case TCPS_SYN_SENT:
2808         case TCPS_SYN_RECEIVED:
2809                 tp->t_flags |= TF_NEEDFIN;
2810                 break;
2811
2812         case TCPS_ESTABLISHED:
2813                 tcp_state_change(tp, TCPS_FIN_WAIT_1);
2814                 break;
2815
2816         case TCPS_CLOSE_WAIT:
2817                 tcp_state_change(tp, TCPS_LAST_ACK);
2818                 break;
2819         }
2820         if (tp->t_state >= TCPS_FIN_WAIT_2) {
2821                 soisdisconnected(tp->t_inpcb->inp_socket);
2822                 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
2823                 if (tp->t_state == TCPS_FIN_WAIT_2) {
2824                         int timeout;
2825
2826                         timeout = (tcp_fast_finwait2_recycle) ?
2827                             tcp_finwait2_timeout : TP_MAXIDLE(tp);
2828                         tcp_timer_activate(tp, TT_2MSL, timeout);
2829                 }
2830         }
2831 }
2832
2833 #ifdef DDB
2834 static void
2835 db_print_indent(int indent)
2836 {
2837         int i;
2838
2839         for (i = 0; i < indent; i++)
2840                 db_printf(" ");
2841 }
2842
2843 static void
2844 db_print_tstate(int t_state)
2845 {
2846
2847         switch (t_state) {
2848         case TCPS_CLOSED:
2849                 db_printf("TCPS_CLOSED");
2850                 return;
2851
2852         case TCPS_LISTEN:
2853                 db_printf("TCPS_LISTEN");
2854                 return;
2855
2856         case TCPS_SYN_SENT:
2857                 db_printf("TCPS_SYN_SENT");
2858                 return;
2859
2860         case TCPS_SYN_RECEIVED:
2861                 db_printf("TCPS_SYN_RECEIVED");
2862                 return;
2863
2864         case TCPS_ESTABLISHED:
2865                 db_printf("TCPS_ESTABLISHED");
2866                 return;
2867
2868         case TCPS_CLOSE_WAIT:
2869                 db_printf("TCPS_CLOSE_WAIT");
2870                 return;
2871
2872         case TCPS_FIN_WAIT_1:
2873                 db_printf("TCPS_FIN_WAIT_1");
2874                 return;
2875
2876         case TCPS_CLOSING:
2877                 db_printf("TCPS_CLOSING");
2878                 return;
2879
2880         case TCPS_LAST_ACK:
2881                 db_printf("TCPS_LAST_ACK");
2882                 return;
2883
2884         case TCPS_FIN_WAIT_2:
2885                 db_printf("TCPS_FIN_WAIT_2");
2886                 return;
2887
2888         case TCPS_TIME_WAIT:
2889                 db_printf("TCPS_TIME_WAIT");
2890                 return;
2891
2892         default:
2893                 db_printf("unknown");
2894                 return;
2895         }
2896 }
2897
2898 static void
2899 db_print_tflags(u_int t_flags)
2900 {
2901         int comma;
2902
2903         comma = 0;
2904         if (t_flags & TF_ACKNOW) {
2905                 db_printf("%sTF_ACKNOW", comma ? ", " : "");
2906                 comma = 1;
2907         }
2908         if (t_flags & TF_DELACK) {
2909                 db_printf("%sTF_DELACK", comma ? ", " : "");
2910                 comma = 1;
2911         }
2912         if (t_flags & TF_NODELAY) {
2913                 db_printf("%sTF_NODELAY", comma ? ", " : "");
2914                 comma = 1;
2915         }
2916         if (t_flags & TF_NOOPT) {
2917                 db_printf("%sTF_NOOPT", comma ? ", " : "");
2918                 comma = 1;
2919         }
2920         if (t_flags & TF_SENTFIN) {
2921                 db_printf("%sTF_SENTFIN", comma ? ", " : "");
2922                 comma = 1;
2923         }
2924         if (t_flags & TF_REQ_SCALE) {
2925                 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
2926                 comma = 1;
2927         }
2928         if (t_flags & TF_RCVD_SCALE) {
2929                 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
2930                 comma = 1;
2931         }
2932         if (t_flags & TF_REQ_TSTMP) {
2933                 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
2934                 comma = 1;
2935         }
2936         if (t_flags & TF_RCVD_TSTMP) {
2937                 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
2938                 comma = 1;
2939         }
2940         if (t_flags & TF_SACK_PERMIT) {
2941                 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
2942                 comma = 1;
2943         }
2944         if (t_flags & TF_NEEDSYN) {
2945                 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
2946                 comma = 1;
2947         }
2948         if (t_flags & TF_NEEDFIN) {
2949                 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
2950                 comma = 1;
2951         }
2952         if (t_flags & TF_NOPUSH) {
2953                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
2954                 comma = 1;
2955         }
2956         if (t_flags & TF_MORETOCOME) {
2957                 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
2958                 comma = 1;
2959         }
2960         if (t_flags & TF_LQ_OVERFLOW) {
2961                 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
2962                 comma = 1;
2963         }
2964         if (t_flags & TF_LASTIDLE) {
2965                 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
2966                 comma = 1;
2967         }
2968         if (t_flags & TF_RXWIN0SENT) {
2969                 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
2970                 comma = 1;
2971         }
2972         if (t_flags & TF_FASTRECOVERY) {
2973                 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
2974                 comma = 1;
2975         }
2976         if (t_flags & TF_CONGRECOVERY) {
2977                 db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
2978                 comma = 1;
2979         }
2980         if (t_flags & TF_WASFRECOVERY) {
2981                 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
2982                 comma = 1;
2983         }
2984         if (t_flags & TF_SIGNATURE) {
2985                 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
2986                 comma = 1;
2987         }
2988         if (t_flags & TF_FORCEDATA) {
2989                 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
2990                 comma = 1;
2991         }
2992         if (t_flags & TF_TSO) {
2993                 db_printf("%sTF_TSO", comma ? ", " : "");
2994                 comma = 1;
2995         }
2996         if (t_flags & TF_FASTOPEN) {
2997                 db_printf("%sTF_FASTOPEN", comma ? ", " : "");
2998                 comma = 1;
2999         }
3000 }
3001
3002 static void
3003 db_print_tflags2(u_int t_flags2)
3004 {
3005         int comma;
3006
3007         comma = 0;
3008         if (t_flags2 & TF2_ECN_PERMIT) {
3009                 db_printf("%sTF2_ECN_PERMIT", comma ? ", " : "");
3010                 comma = 1;
3011         }
3012 }
3013
3014 static void
3015 db_print_toobflags(char t_oobflags)
3016 {
3017         int comma;
3018
3019         comma = 0;
3020         if (t_oobflags & TCPOOB_HAVEDATA) {
3021                 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
3022                 comma = 1;
3023         }
3024         if (t_oobflags & TCPOOB_HADDATA) {
3025                 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
3026                 comma = 1;
3027         }
3028 }
3029
3030 static void
3031 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
3032 {
3033
3034         db_print_indent(indent);
3035         db_printf("%s at %p\n", name, tp);
3036
3037         indent += 2;
3038
3039         db_print_indent(indent);
3040         db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
3041            TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
3042
3043         db_print_indent(indent);
3044         db_printf("tt_rexmt: %p   tt_persist: %p   tt_keep: %p\n",
3045             &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
3046
3047         db_print_indent(indent);
3048         db_printf("tt_2msl: %p   tt_delack: %p   t_inpcb: %p\n", &tp->t_timers->tt_2msl,
3049             &tp->t_timers->tt_delack, tp->t_inpcb);
3050
3051         db_print_indent(indent);
3052         db_printf("t_state: %d (", tp->t_state);
3053         db_print_tstate(tp->t_state);
3054         db_printf(")\n");
3055
3056         db_print_indent(indent);
3057         db_printf("t_flags: 0x%x (", tp->t_flags);
3058         db_print_tflags(tp->t_flags);
3059         db_printf(")\n");
3060
3061         db_print_indent(indent);
3062         db_printf("t_flags2: 0x%x (", tp->t_flags2);
3063         db_print_tflags2(tp->t_flags2);
3064         db_printf(")\n");
3065
3066         db_print_indent(indent);
3067         db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
3068             tp->snd_una, tp->snd_max, tp->snd_nxt);
3069
3070         db_print_indent(indent);
3071         db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
3072            tp->snd_up, tp->snd_wl1, tp->snd_wl2);
3073
3074         db_print_indent(indent);
3075         db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
3076             tp->iss, tp->irs, tp->rcv_nxt);
3077
3078         db_print_indent(indent);
3079         db_printf("rcv_adv: 0x%08x   rcv_wnd: %u   rcv_up: 0x%08x\n",
3080             tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
3081
3082         db_print_indent(indent);
3083         db_printf("snd_wnd: %u   snd_cwnd: %u\n",
3084            tp->snd_wnd, tp->snd_cwnd);
3085
3086         db_print_indent(indent);
3087         db_printf("snd_ssthresh: %u   snd_recover: "
3088             "0x%08x\n", tp->snd_ssthresh, tp->snd_recover);
3089
3090         db_print_indent(indent);
3091         db_printf("t_rcvtime: %u   t_startime: %u\n",
3092             tp->t_rcvtime, tp->t_starttime);
3093
3094         db_print_indent(indent);
3095         db_printf("t_rttime: %u   t_rtsq: 0x%08x\n",
3096             tp->t_rtttime, tp->t_rtseq);
3097
3098         db_print_indent(indent);
3099         db_printf("t_rxtcur: %d   t_maxseg: %u   t_srtt: %d\n",
3100             tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
3101
3102         db_print_indent(indent);
3103         db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u   "
3104             "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
3105             tp->t_rttbest);
3106
3107         db_print_indent(indent);
3108         db_printf("t_rttupdated: %lu   max_sndwnd: %u   t_softerror: %d\n",
3109             tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
3110
3111         db_print_indent(indent);
3112         db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
3113         db_print_toobflags(tp->t_oobflags);
3114         db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
3115
3116         db_print_indent(indent);
3117         db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
3118             tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
3119
3120         db_print_indent(indent);
3121         db_printf("ts_recent: %u   ts_recent_age: %u\n",
3122             tp->ts_recent, tp->ts_recent_age);
3123
3124         db_print_indent(indent);
3125         db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
3126             "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
3127
3128         db_print_indent(indent);
3129         db_printf("snd_ssthresh_prev: %u   snd_recover_prev: 0x%08x   "
3130             "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
3131             tp->snd_recover_prev, tp->t_badrxtwin);
3132
3133         db_print_indent(indent);
3134         db_printf("snd_numholes: %d  snd_holes first: %p\n",
3135             tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
3136
3137         db_print_indent(indent);
3138         db_printf("snd_fack: 0x%08x   rcv_numsacks: %d\n",
3139             tp->snd_fack, tp->rcv_numsacks);
3140
3141         /* Skip sackblks, sackhint. */
3142
3143         db_print_indent(indent);
3144         db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
3145             tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
3146 }
3147
3148 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
3149 {
3150         struct tcpcb *tp;
3151
3152         if (!have_addr) {
3153                 db_printf("usage: show tcpcb <addr>\n");
3154                 return;
3155         }
3156         tp = (struct tcpcb *)addr;
3157
3158         db_print_tcpcb(tp, "tcpcb", 0);
3159 }
3160 #endif